If you have a touch screen windows mobile phone, you may know have frustrating it is to take the phone out of your pocket and finding you have been connected to the speaking clock for 45 mins.
Now, I know there's a built in key pad lock.. However, check out S2U2 (Slide to unlock)
S2U2 is a simple lock/unlock application which has the iPhone style slide unlocking. It can be used as a screensaver while you don't use your device. It has CallerID function (but may not work on some devices, so please try it first); S2P control plugin; and volume control. It can show many system information (customizable) even without unlocking.