Great news: It seams that HTC finally released the source code for the Desire Froyo kernel at developer.htc.com
member.america.htc.com/download/RomCode/Source_and_Binaries/bravo-2.6.32-gd96f2c0.tar.gz
member.america.htc.com/download/RomCode/Source_and_Binaries/bravo-2.6.32-gd96f2c0.tar.gz