I don't know if anyone has suggested this (I did the search thing) but
I think it would be great to get an e-mail notifying us if one of our posts/treads is deleted, and a very short explanation of why. Sometimes I notice my post count go down, but I can't remember what I posted. Other times I don't know what it was about my post that provoked its deletion.
This would help a lot of people, but mainly newbs.