"HTC Touch2 brings you the added value of being able to unlock your device with a convenient way. Your device will be more responsive to resume after â€œsleepingâ€ to conserve power".
Itâ€™s availible for devices with WM6.5 builds between 21849 and 21874 (Settings->System->About Ex: â€œCE OS 5.2.21869 (Build 218126.96.36.199). The AKU version is 21869", so if it applies to you, head on over to HTC, and install it. (Note, itâ€™s misnamed on the page).