Damn, Eric... he wins twice...
for finding this AWESOME new Google app, Google Latitude. Latitude lets you see where your friends are and what they are up to (but only if they want you to). Unlike Loopt, which I have been using for a while now, Latitude does not require a GPS phone and can be used from you iGoogle page. Try it out, here is the link: http://www.google.com/latitude/intro.html
Here's the complete list of things you can do using Latitude:
"Everything about Latitude is opt-in. You not only control exactly who gets to see your location, but you also decide the location that they see. For instance, let's say you are in Rome. Instead of having your approximate location detected and shared automatically, you can manually set your location for elsewhere — perhaps a visit to Niagara Falls. Since you may not want to share the same information with everyone, Latitude lets you change the settings on a friend-by-friend basis. So for each person, you can choose to share your best available location or your city-level location, or you can hide."
You can read more about Latitude by checking out this blog post: http://gmailblog.blogspot.com/2009/02/see-where-your-friends-are-with-google.html