What's the new little "lock with an arrow around it" icon that's now appearing at the top of all my screens now (to the left of the battery percentage)? I just noticed it the other day. I don't have a passcode set and when I did set one to test it, this icon didn't change at all. Just bugging me that I dont' know what it's for..thanks.
MacBook Pro 17", Mac OS X (10.6.4), iphone 3GS 4.2.1