I asked this question a couple of weeks ago, and I don't think it was responded to. I don't know if this is common knowledge but I hit the half moon and enter at the same time and it locked the phone.
The alternate shortcut key is "K" ... but this only works when you've got dialing disabled from home screen (Phone options) in order to re-enable icon shortcuts in the main screen.
Good tip about the Alt+Etner though! Is this a 4.0 specific tip?
i'm not sure. i was simply in the bathroom at work and started pressing all my buttons hoping something would happen. i do have 4.0 with the 7250 for verizon.