DH suggests the regular Monster and Dice as the places most of his IT guys go. He is in the Houston IT marketplace. He is a senior-level project manager.
However, his last 3 positions (high turnover field) have been found through direct relationships...for example, the company he is currently with was one that he had worked for as a consultant through an IT consulting firm. The one he is going to in August is one where his current company brought in a consulting group and he formed a relationship with them. He was not looking to leave and would not have spoken with them except for the fact that his current company is experiencing major layoffs and he was on the list. Most of the interviews/soft job offers he got (you know the "we've got a job for you anytime you want it") were from direct relationships based on previous work.
Therefore I would strongly suggest talking to current IT employees or even high-level IT professionals at other companies that you have access to due to relationships (church, neighborhood, professional groups, etc)
DH has NOT had good experience with IT recruiters. Because honestly, they are playing and selling both sides.