We've found this product also, but ... it's not available yet :-( We've been talking to the Blatand people already and they say it will be available about end of 2007. I hope so, because we're looking desperately for a product like this.
When we have the hardware, you'll get the software asap, that much I can promise!
If anybody should know a Bluetooth based heart rate monitor belt other than the one from Alive Technologies (not suitable because too medical) and the proposed one from Blatand - please post here.