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 option “Power Save”; default is on (1). It aims to save the power:
1. by stopping all S2U2’s activities when the device is turned off (including when the screen is off only);
2. by not interfering the power management which is already done by the OS;
3. suggest users to try it with the default values of “Safe Mode” (0) & “Don’t Suspend Power” (0);
4. suggest to soft-reset the device after the installation of this version or changed this setting.
(However, if it’s found S2U2 consumes more power than before, suggest to disable “Power Save” (0). Then S2U2 would run in the same way as v1.3x)
– added option “Digital Battery” to display the remaining battery in percentage.
– added “inertia feeling” to the slide button.
– fixed the occasional problem introduced in v1.3x that the clock could not be displayed.
– fixed the occasional problem that the system is locked after dialling out.
– some minor bugs fixed.

http://forum.xda-developers.com/showthread.php?t=464695