I had my stock 1.1.1 unlocked and the Iphone doesn't seem to automatically sleep after one minute (default) as the manual says. The screen will stay on indefinetly until I push the sleep button. Anybody else experiencing this? Is there a setting somewhere that I can check this? Thanks!

Set Auto-Lock to 1 minute in settings.
This happens cause when you unlock, you need to turn off auto-lock.
Go to settings > General > Auto-Lock > 1 Minute.

Mine has same problem, set autolock to 1 min, but screen only dim out a bit and thats is all, not total black out and lock.......