Increase your HTC Diamond battery life
Ricardo Chaves from pocketpt.net wrote an article about nueDynamicClock which is a software that allows the user to control the CPU Clock.
But unlike many CPU Clock management software, this application doesn’t allow over clocking, instead it helps the user define an inferior clock speed than the normal one so that the battery doesn't get drained out so fast.
The software also works with any device with Qualcomm MSM7201A or MSM7501A processors, meaning you can use it with the HTC PRO, Touch HD and the Sony Ericsson Xperia X1.
If you wish to try this software you can do it for free by downloading it here.