On the location based community topic, I saw an example of such a service called Loopt which Boost Mobile is showing off at the show. Very cool stuff. It lists exactly how far away everybody on your buddy list is from you at any given moment, and it provides a map overlay to help you find any individual you choose. It's all opt-in, of course. But there's still some work to be done on the LBS front. -Antony [1]
Links:
[1] mailto:antony@fiercemobilecontent.com