I agree. This program is useful for not only the "Cool, it's just like the iPhone" factor, but also it keeps you from randomly opening things when not actually using the phone. The latest update gets rid of the memory leak that was plaguing earlier versions. So far this has not drained any of my memory, and I've had it installed for several hours. The real test will come in the morning, though.
Here's the link for the updated version and latest patch:
http://www.freewareppc.com/utilities/slide2unlock.shtml