S2U2 (Slide2Unlock2) 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 a CallerID function (but some devices may not work, so please try it first); S2P control plugin; and volume control.

Changes:

– changed the Volume Control layout so that Volume Up/Down keys can toggle between normal, silent and vibrate.
– added support to “Simple Mode” volume control on some new HTC devices.
– added support to “My Location” weather with TouchFLO 3D v2.5.
– added an option to lock the device after any phone call when Bluetooth is on. (S2U2 Settings -> General)
– improved compatibility with WM6.5 devices, especially the CallerID. but it’s not recommended to use the CallerID together with the WM built-in lock.
– fixed an occasional power leak when the device is sleeping.
– added Bulgarian language support.
– a few minor bugs fixed.

http://forum.xda-developers.com/showthread.php?t=527523