> I was wondering what the minimum exit policy was (wrt port 80 and 443) for a Tor exit relay. 

"A router is called an 'Exit' iff it allows exits to at least two of the ports 80, 443, and 6667 and allows exits to at least one /8 address space."

As an aside, I just noticed there's a typo in the spec there at line 2294 -- it reads"iff" instead of "if".