CLIENT CHECK-IN

1 . A mobile device, comprising:

a communication interface configured for communicating with one or more other devices associated with the mobile device;

a selectable control configured for user selection to initiate a check-in notification that indicates at least a location of the mobile device and a timestamp of the date and time; and

a processing system to implement computer instructions as a check-in service that is configured to initiate communication of the check-in notification to the one or more other associated devices responsive to the user selection to initiate the check-in notification.

2 . A mobile device as recited in claim 1 , further comprising a user interface configured for display on an integrated display of the mobile device, wherein the selectable control is displayed for touch selection on the user interface.

3 . A mobile device as recited in claim 1 , wherein the check-in service is configured to:

receive a check-in request from one of the other associated devices to initiate the check-in notification; and

initiate communication of the check-in notification to the one or more other associated devices responsive to the check-in request.

4 . A mobile device as recited in claim 1 , wherein the check-in service is configured to initiate communication of the check-in notification to the one or more other associated devices in multiple formats that include at least one of a text message, a message that includes a URL, an instant message, an audible message, or an image for display at the one or more associated devices.

5 . A mobile device as recited in claim 1 , wherein the check-in notification includes at least one of an image of the location, a URL, a map of the location, or displayable text.

6 . A mobile device as recited in claim 1 , wherein the check-in service is configured to save the check-in notification to the memory, and wherein the saved check-in notification is reviewable.

7 . A mobile device as recited in claim 1 , wherein the check-in notification includes a user-selected formatted message configured for communication to the one or more other associated devices.

8 . A mobile device as recited in claim 1 , wherein the check-in service is configured to initiate a reminder for a user of the mobile device that the check-in notification has not been initiated for communication to the one or more other associated devices.

9 . A mobile device as recited in claim 1 , wherein the check-in service is configured to initiate communication to the one or more other associated devices at least one of:

time-based check-in notifications based on elapsed time intervals; or

location-based check-in notifications based on the mobile device arrival at preset locations.

10 . A mobile device as recited in claim 1 , wherein the check-in service is configured to initiate communication of the check-in notification when at least one of the other associated devices is proximate the device at the location.

11 . A mobile device as recited in claim 1 , wherein the check-in service is configured to:

receive a separate check-in notification from one of the other associated devices; and

initiate communication of a formatted notification response to the other associated device responsive to receiving the separate check-in notification.

12 . A mobile device as recited in claim 1 , wherein the check-in service is configured to initiate a reminder for a user of the mobile device that a separate check-in notification should have been received from one of the other associated devices.

13 . A method, comprising:

displaying a user interface that includes a selectable control for user selection to initiate a check-in notification that indicates a location of a mobile device and a timestamp of the date and time;

receiving a user input of the selectable control to initiate the check-in notification; and

communicating the check-in notification to one or more other associated devices of the mobile device.

14 . A method as recited in claim 13 , further comprising:

receiving a check-in request from one of the other associated devices to initiate the check-in notification; and

initiating communication of the check-in notification to the one or more other associated devices responsive to the check-in request.

15 . A method as recited in claim 13 , wherein the check-in notification is communicated to the one or more other associated devices in multiple formats that include at least one of a text message, a message with a URL, an instant message, an audible message, or an image for display at the one or more other associated devices.

16 . A method as recited in claim 13 , further comprising:

initiating a reminder for a user of the mobile device that the check-in notification has not been communicated to the one or more other associated devices.

17 . A method as recited in claim 13 , further comprising at least one of:

communicating time-based check-in notifications to the one or more other associated devices based on elapsed time intervals; or

communicating location-based check-in notifications to the one or more other associated devices based on the device arrival at preset locations.

18 . A method as recited in claim 13 , wherein the check-in notification includes a user-selected formatted message that is communicated to the one or more other associated devices.

19 . A check-in system, comprising:

a network service device to execute computer instructions as a check-in service that is configured to:

receive a check-in notification from a mobile device when the check-in notification is initiated by a user of the mobile device, the check-in notification indicating a location of the mobile device and a timestamp of the date and time;

determine one or more other devices associated with the mobile device based on identifiers of the mobile device and the one or more other associated devices; and

communicate the check-in notification received from the mobile device to the one or more other associated devices.

20 . A check-in system as recited in claim 19 , wherein the check-in service is configured to communicate the check-in notification to the one or more associated devices in multiple formats that include at least one of a text message, an instant message, a message with a URL, an audible message, or an image for display at the one or more associated devices.