A Foursquare widget would be perfect for SmartScreen! Foursquare is a social media app that allows you to "check-in" to locations like restaurants, movie theaters, etc, and allows you to see where your friends are at any time. The SmartScreen Foursquare widget could just show the five most recent check-ins of your friends and that's it. Very simple!

The Foursquare for Android app already has a widget that does the same thing. Here's a screenshot: http://farm3.static.flickr.com/2459/4095830287_c868cceb86.jpg

Foursquare has an API to plug into. Here is the link to their documentation: http://groups.google.com/group/foursquare-api/web/api-documentation?_done=%2Fgroup%2Ffoursquare-api%3F

Any questions, just ask!