Federated searches implemented across multiple search engines

1. A method, comprising steps of:

generating a generated query based at least in part on a certain search query;

submitting the generated query to a particular search engine;

in response to submitting the generated query to the particular search engine, receiving from the particular search engine results indicating a first plurality of search engines;

selecting a second plurality of search engines from the first plurality of search engines;

to obtain search results for said certain search query, submitting one or more search queries to said second plurality of search engines;

for each search engine of said second plurality of search engines, receiving certain search results for said one or more search queries submitted to said each search engine; and

consolidating said certain search results, which are received from each search engine of said second plurality of search engines, to produce a consolidated set of search results;

presenting said consolidated set of search results to a user, wherein particular search results of the consolidated set of search results are visually grouped into search result groups based on the search engine from which each of said particular search results was received;

wherein the steps are performed by one or more computing devices.

2. The method as recited in claim 1 wherein said results indicating the first plurality of search engines are based at least in part on information describing each search engine of said first plurality of search engines.

3. The method as recited in claim 1 wherein said submitting one or more search queries to said second plurality of search engines further comprises:

generating a particular query based at least in part on said certain search query; and

submitting said particular query to at least one search engine of said second plurality of search engines.

4. The method as recited in claim 1 wherein one or more of said second plurality of search engines comprise a web site.

5. The method as recited in claim 1 wherein selecting said second plurality of search engines comprises selecting a search engine index.

6. The method as recited in claim 1 wherein said consolidating comprises combining results returned from each search engine of said selected second plurality of search engines into a single set of search results for presentation to an end user submitting said certain search query.

7. The method as recited in claim 6 wherein said single set of search results is ranked according to relevance.

8. The method as recited in claim 6 wherein one or more results of said single set of search results are grouped according to which search engine of said second plurality of search engines returned said one or more results.

9. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 1 .

10. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 2 .

11. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 3 .

12. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 4 .

13. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 5 .

14. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 6 .

15. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 7 .

16. A computer-readable volatile or non-volatile medium storing one or more sequences of instructions which, when executed by one or more processors, causes the one or more processors to perform the method recited in claim 8 .

17. A system, comprising:

a computer system, comprising one or more computing devices, configured to:

generate a generated query based at least in part on a certain search query;

submit the generated query to a particular search engine;

in response to submitting the generated query to the particular search engine, receive from the particular search engine results indicating a first plurality of search engines;

select a second plurality of search engines from the first plurality of search engines;

to obtain search results for said certain search query, submit one or more search queries to said second plurality of search engines;

for each search engine of said second plurality of search engines, receive certain search results for said one or more search queries submitted to said each search engine; and

consolidate said certain search results, which are received from each search engine of said second plurality of search engines, to produce a consolidated set of search results;

present said consolidated set of search results to a user, wherein particular search results of the consolidated set of search results are visually grouped into search result groups based on the search engine from which each of said particular search results was received.

18. The method as recited in claim 1 wherein said consolidating said certain search results is based at least in part on preferences of an end user submitting said certain search query.

19. The method as recited in claim 1

wherein said selecting said second plurality of search engines from said first plurality of search engines is based at least in part on ranks for each search engine of the first plurality of search engines; and

wherein said second plurality of search engines include the most relevant search engines from said first plurality of search engines;

wherein the most relevant search engines are determined based on the ranks of the first plurality of search engines.

20. The method as recited in claim 1 , wherein said consolidating comprises combining results returned from said selected second plurality of search engines into a plurality of sets of search results corresponding to each search engine of said second plurality of search engines for presentation to an end user submitting said certain search query.

21. The method as recited in claim 1 further comprising:

determining a rank for each search engine of the second plurality of search engines;

wherein presenting said consolidated set of search results further comprises ordering said search result groups based on said rank for each search engine of the second plurality of search engines.

22. The method as recited in claim 1 further comprising:

presenting to the user a list of said second plurality of search engines;

wherein the list of said second plurality of search engines is visually independent from the consolidated set of search results.

23. The method as recited in claim 1 , wherein the consolidated set of search results includes a reference to a referenced search engine of the second plurality of search engines, further comprising:

receiving a selection, from the user, of the referenced search engine; and

in response to receiving said selection of the referenced search engine, displaying search results from the referenced search engine.