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:

– removed the option “lock the device after any phone call when Bluetooth is on”.
– added option “InCall Lock” (S2U2 Settings -> General)
either don’t lock the device during a phone call; always lock; or only when Bluetooth is on.
if CallerID is enabled, connected time of the call will be shown on the lock screen.
– added option to release the Volume Control key lock, i.e. adjust the volume even it’s locked. (S2U2 Settings -> Phone)
– fixed an occasional issue that Dotfred’s TaskMgr would hang when running S2U2 since v2.x.
– fixed the small volume bar of the VGA/WVGA S2P control plugin.
– fine tuned the CallerID and S2U2 Settings for HTC Pro2 & HD2.
but it’s not recommended to use the CallerID together with the WM built-in lock.
– a few minor bugs fixed.

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