review my startup, a planning/analysis app for cyclists
Maciek416: Nice idea!You should let people drop in their RunKeeper user URL and scan their activities GPX data from there (it's all there).Quite a few people I know use RunKeeper for cycling now because it's one less device to buy/maintain/ride with (running on the iPhone and all). In addition, the RK guys are likely to help you promote your service -- they're quite active with respect to their community.