We now have
a sticky. TwoPlusTwo doesn't allowed unlocked stickies, so please make any suggestions/corrections here, whether they're changes to current answer or additional questions.
For discussions that could read as advertisements (e.g. "Which virus protection should I use?"), I'll likely start threads like "FAQ: Which virus protection should I use?". That way we can get the general consensus without any official endorsement from 2+2.
-Sam