That's a good idea, but I don't think it stops people from seeing your AO Nick (Does it?). While going to another anonymous message board or creating a new nick is possible, its impractical, and can let people get away with things scot free.

Any other ideas?
No, it wouldn't stop people from seeing your nic... but if you have a question that you think might damage your reputation or make people dislike you, just get a spare account and ask your ? under a different screen name.