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:

– added auto-checking of missing core graphic files.
– added options to mark an already previewed SMS/Email as “read”.
– added “Country/Region Code” to set the proper Canonical number format for different devices.
– fixed the issue that system was unstable after a phone call on some devices.
– removed the notification queue warning introduced in v2.02.
– fixed the CallerID did not work on some devices (e.g. Spainish) but used to work in v1.6x.
– fixed the issue that after soft-reset, the first CallerID would not be shown on some devices.
– improved Ans/End response.
– fixed the issue that some hardware keys not locked on some devices.
– fixed SMS/email pop-up ocassionally not the same as the one opened when “slide to view”.
– fixed the Task date was not update when changed.
– a few minor bugs fixed.

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