I found something really interesting!
A new ANDROID package has been released. It's still incomplete: no connection (1x - EVDO or WIFI), but the colors and keyboard issues are fixed so your can see and feel Android.
(Runs well on my TELUS CDMA DIAMOND)
Download it, and run it. You don't have to flash your phone or install anything. It runs like an application. The first boot is REALLY long (3 - 4 minutes) Don't reset your phone. It'll work!
I take no credit! They did all the work, i'm just sharing the info:
The Android port for the HTC Diamond
More infos on the current state of the project