For people who have problems placing a motherboard on standoffs without scratching the board, put some masking or electrical tape over the standoffs, then screw through the tape later.
Heh, true, but less contact. I just see no real need to do this. Even for first timers, its a non-issue if they're handling the parts properly. But I guess there are people who aren't as careful as others and could use this tip.
I ran into someone the other day who was having this problem. I'm always able to place the motherboard correctly, but it's good advice for people who aren't sensitive. =]