Well THG had this to say:
Simultaneous to the launch of the new Athlon with the T-bred core, AMD has given the following guideline to the motherboard makers: starting June 10, all motherboards must have integrated thermal protection in order to receive certification from AMD.
and
In the short term, a general improvement on the market is not in sight, because most of the manufacturers have long since introduced their KT-333 boards, and moreover, they don't expect to integrate thermal protection circuitry on their boards until a new chipset has been launched (e.g., VIA KT333A or KT400).
Which makes me question whether AMD will still warranty T-Breds if they are installed in a non AMD certified motherboard.