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:

– fixed the error in v2.10 when GIF wallpaper is used together with “Battery on top” turned on.
– fixed the CallerID problem that if your device works with v2.0x but not with v2.10.
– fixed an occasional power leak that new message is received when the device is sleeping.
– fixed the occasional problem that the taskbar is distorted when unlock.
– “Curtain Opacity” now works with “Float” top curtain.
– improved compatibility with WM6.5 devices, especially the CallerID.
– added Lithuanian language support.

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