@orenfl, Apologies for missing your question until now.
I just wrote a post at RunningDigital
covering all today's available wireless sensor options for mobiles. Having HTC Desire, I am mostly interested in Android-friendly sensors, but I tried to cover as much as I could. Not only Bluetooth, but ANT+ solutions as well.
Motivation for the post stemmed from errors in press releases that TexasInstruments and ANT+ made during the MyTracks/HTC/SRM/ANT+/Suunto Tour de France project. There, modified HTC Legends were used to stream rider data to audiences.