I tried an old build of Android 1.6 from Oktober or so... worked fine on my Touch Pro.
Now I downloaded XDANDROID.01.03.10.7z and RAPH800-XDANDROID-AIO-2010-03-12.7z, both crash while booting:

kernel BUG at kernel/workqueue.c:188!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000

Any idea what this could cause?