I recently installed the HTC EndKey application in my HTC Touch, and I must advise you not to do so, mainly due to:
1.- This app is not very useful for the Touch, as it only gives you quick shortcuts for funcs like: lock phone (the htc touch is lockable via a long press in the red button), vibration mode (easily accesible in the speaker config icon), airplane mode (it may be useful if you take a plane twice a day...)...
2.- It seems that there´s no single way in the hell to remove it, appart a hard reset. When you install it, the HTC Touch warns you about it, because its a WM5 app. That should be no problem, but when you try to uninstall it, an error occurs, and it´s not removed.
If anyone knows how to uninstall without doing a hard reset, please post it here...
Cheers !