I adore hipmunk, especially the multi-tab functionality. But frankly, the prices I get for here in Asia are NEVER as good as I get from a travel agent.

Adioso.com is much better and more flexible, but their coverage is extremely limited.

If Hipmunk were as flexible as Adioso (i.e. queries that show me flights from "ICN to anywhere before February 12"), then I'd be all about Hipmunk. As it stands, doing exact searches in Hipmunk get me "good" deals, but not "great" deals.