Here is a cab for HTC Diamond keyboard + Keypad and qwerty . It should work fine. It will ask you to reset your device and then it will give you 3 new KB layouts. Touch Diamond Keyborad, Touch Diamond Keypad and Touch Diamond Qwerty. Hope you guys like it.

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Source : xda-developers.com
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HTC Diamond keyboard

Tags: cell phone, freeware, HTC Touch Diamond, keyboard, Mobile, PDA, Pocket PC, PocketPC, PPC, Windows Mobile