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Stumbled across this at the weekend and have started having a play - a tracking system for your phone (best if it has a GPS unit), that then allows you to synch to a website so you can review your rides/activities.
Iphone app called OutFront doies replaying of the route and stuff as well - looks really good (but not good enough to make me want an Iphone!).
Anyway, in case you haven't heard of it and it appeals - [url= http://www.mapmytracks.com ]www.mapmytracks.com[/url] - seems to be a really nice tool to have.
Been using bikely (bike radar now?) for years for uploading and sharing GPS, but it's a bit hit and miss depending on area.