For all those interested, here is the new version of S2U2.
Requirements:
WM5 Phone or WM6/6.1/6.5 Professional devices
free RAM: at least 1M for QVGA/WQVGA; 4M for VGA/WVGA
Overview: 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 it may not work on some devices, so try it before use it daily); S2P control plugin; and volume control. S2U2 shows many system information even without unlocking and highly customizable.
Changes of v2.14:
- 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.