While I agree in concept, in use I don't really see the need for moderators to see who posted what if it's anonymous.

Firstly, I don't see the need for the anonymity in the first place. It's an online forum. How many of us really know anyone else on here?

Secondly, if a user posts something objectionable in anon-mode and a mod sees it, he can simply trash it then alert an admin. The admin can still read the post in the trash can, and he can take whatever action is appropriate.

What is it they say about silence being golden?