Comment is free 2
Also recommended: Brian Whitaker.
Engage has some good stuff at the moment, on conservative neo-realists and the "Israel lobby", on Ken Livingstone, etc. Both Engage and Comment is Free focus heavily on the John Mearsheimer and Stephen Walt article in LRB on the "Israel Lobby". For more on this, see Martin Kramer's Sandbox [via Snoopy] and Rosner's Blog [via Kramer].