We have two nice ones listed in our "How To" secion:
JuicyRom and MightyRom - Sprint, Alltel, Tellus
First two posts found here:
http://www.alltouchdiamond.com/index.php/board,5.0.htmlI am using MightyRom 2.7 right now because it seems to be more stable than Juicy's. Juicy did come out with a 2.6 upgrade from the last one of his I tried, so it could be a nice choice as well. Both have benefits of having all the major tweaks for extra battery life and faster performance all around. In other words, they take the "bloat-ware" out of the phone, and provide a fresh operating system. They both add things like the FM Radio feature back onto the Diamond, and have unique customizations to better the overall experience.

**Remember** that we are only providing the information on this site, as a portal to where the Roms are located at. When flashing, you are part of a "testing" community. Nothing is guaranteed to work, and bugs will most likely be found along the way. Flashing Roms is at the users own risk.