S2U2 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. And it's has a CallerID function (some devices may not work, so please try it first); and S2P control plugin.

S2U2 is the new version of Slide2Unlock because the old one is a RAM hunger and running it at Landscape mode caused a lot of troubles. So the author started to rewrite the whole thing in C++... and, here it is the new born baby - S2U2. As a new start, this is the most basic version, i.e. it does not have the Caller ID, unread xxx notifications, etc...



Installation:
- If you have Slide2Unlock installed, please uninstall it first & then soft-reset.

- After installation, there are 3 shortcuts created under Program FilesS2U2:
iLock2.lnk - start/stop ilock2.exe (on the 1st run, it runs silently in the background; on the 2nd run, it closes iLock2 & S2U2)
s2u2.lnk - manually start S2U2 (be sure iLock2 is running in the background, otherwise the Battery status will not be updated).
s2u2 Settings.lnk - change the settings of S2U2.

- A shortcut for iLock2.exe is created automatically under "WindowsStartUp" as well.

- Installation on Storage Card is not recommended for the sake of stability.

- For hi-res devices, d/l the S2U2ClockPack.rar & follow the steps in the ClockReadme.txt. Otherwise the clock will be shown as half-sized.

- For additional clock fonts, d/l the S2U2ClockPack.rar & follow the steps in the ClockReadme.txt.

- For non-English devices, d/l the S2U2LanguagePack.rar; extract your language's ini file; rename it to lang.ini; copy to the S2U2 installed folder; restart iLock2.

for more information check this developer forum post

Update Description:
v1.05 (18-06-2008):
- Fixed the bug introduced in v1.02 that the clock did not update occasionally on device wake up;the idle time out occasionally malfunction; and the wallpaper did not change occasionally.
- The total unread count for FlexMail now reads to a maximum of 10 storages.
- Fixed the bug that displayed night icon for Spb Weather.
- Fixed the bug that some devices could not run probably on landscape mode.
- Added support to RealVGA.
- Added support to WVGA & WQVGA. - Some minor bugs fixed.

You can download the Clock Pack also here.