I currently use Britcoin and Intersango Euro and am really happy with both of them.
They provide great service someone is almost always in the IRC and all round I'm a happy camper. I really don't understand why a lot more peeps don't take advantage of this excellent service which atm is free apart from bank fees.
Compared with other exchanges that have 2-3% withdrawal fees or even ones set ridiculously high 12-22Euro at one site this is where is should be happening atm.