Cellflare
 

A few friends on Facebook has started using this. It works great. With it you can:

• Keep tabs on all your contacts (friends, kids, etc.)
• Track your history (or those of contacts)
• Quick locate (friends can find you with your permission

It's free and works with WinMo. I don't work for them...just thought some folks might be interested.

http://www.cellflare.com/Default.aspx