Right now the only way to contact another member privately is to ask for their AIM or email. A built-in PM system would be really useful, especially for the Buy/Sell/Trade board.

Is this something that's being considered?

Huge +1 for this. I want to discuss prices with sellers without broadcasting it to the whole forum.

Even a simple inbox/outbox system would be enough. Doesn't need to be fancy.

This would also help with moderator communication. Being able to PM someone about a rule violation instead of calling them out publicly would be much better.