The technologies behind trapster are include WiFi and wireless mobile towers, if your mobile phone has GPS then you could get more precise position of your where about. Plus trapster works with Google Maps & Jott.
If you're interested, you could go to trapster website here to download the application and to sign-up; you need to sign-up in order to use trapster service. Or download it directly from your web browser mobile phone here. The supported mobile phone OS are Symbian 60, WinMob 5/6, BlackBerry & Java enabled mobile phones. According to WebWare; iPhone will be included into their next roadmap, and because the application is still in beta phase you should be aware if there are any glitch or errors encountered while using it. WebWare cover the complete review of trapster, so read on here to dig more infos.
Personally I think that trapster works almost feel like social networking, but nevertheless even with trapster in your mobile phone; drive save all the time!
(blogged with my Treo 750v)