Out now in Cydia, it lets you "fold up" your lockscreen to unlock. Pretty cool effect, but it does overwrite any custom slider you might be using. Free.
http://www.idownloadblog.com/2012/05/23/unfold-tweak-now-available/
http://www.idownloadblog.com/2012/05/23/unfold-tweak-now-available/