Hi, I'm the co-owner of CrossFit Quantum in Toronto, and co-author of As Rx'd, which is still under going development, just really slowly. Combine that with the iPad and there are so many tempting avenues to follow.
There are certainly a number of interesting services to talk to nowadays, location-based ones would have been a no-brainer if they were around when we were writing As Rx'd.
If you'd like to chat about anything my email is in my profile.