Oh look, it's THIS thread again...

So I have BTC and USD scattered across various exchanges (BTC-e, Mt.Gox etc). I can easily consolidate by buying BTC and withdrawing to my personal wallet, but this isn't financially optimal due to the varying exchange rates. I'm curious if anyone has devised a compatibility matrix of the various e-currency exchange services. For example, BitInstant seem happy to transfer from Mt.Gox to BitStamp, but not to BTC-e, aurumXchange will transfer from BitStamp to BTC-e, but not from Mt.Gox to anything (apparently).

Would I be correct in assuming that to transfer USD out of Mt.Gox you have to be verified? I can find literally nothing on Mt.Gox coupons/vouchers - their FAQ only briefly describes redemption for adding funds (not withdrawing).