Slide to unlock is an screensaver that shows photos from your harddisk or from any flickr user you specify. This way, you always have an updated screensaver without doing anything.
Does your friend take awesome pictures and uploads them to flickr? Slide to unlock is for you, without any work, you will always see his latest photos directly on your screen.
Do you carry your tablet PC a lot and your screensaver always exits when you accidently touch the screen? Slide to unlock is for you, thanks to the optional slider functionality, your screensaver will not accidently exit anymore