Hello
I use E71 and SportsTracker. While trying to make sense out of why it is not possible to just go into any sports shop or webshop for gadgets and buy a bluetooth heart rate monitor that sends data to any phone, I came over this nice product: http://www.mobimotion.com/inde
It is a bluetooth heart rate monitor without the added politics and limitations we see from Polar. They even offer a SDK for partners, and I see Sony Ericsson is already on the case. Nokia: Go go go! I would bet it would take less than a week to get this working and sending data to any Nokia phone with BT and SportsTracker installed.