I say pattern lock, and thinks i also forgot bout the update! LMAO!
I'm a little late to the party but Stormlock is hard to beat. Very simple, free app. I don't use it anymore because I discovered the wonderful world of Patternlock though. ;)
PatternLock does look pretty cool...but I never lock my phone. I keep it on my belt in a seidio holster...(Oh BTW...order the innocase 360 for the storm...it just came out..) so I never need it locked 'cept when I'm talking to someone.