Windows Mobile: HTC Touch Diamond ROM Gives Faster TouchFLO and 850MHz Support:
"A ROM update from Hong Kong for the HTC Touch Diamond released yesterday adds some fantastic functionality such as the use of the 850MHz GSM band (used by AT&T here in the US) and the improved TouchFLO 3D performance. (For the record, the performance update is great.) There are also a few bug fixes like the 'no signal issue' and home page loading. Grab it at the links from XDA Devs."