I worked for AeroTek (MaximGroup) for 4 years as independent consultant. They represented me in 4 major states and I am now in SF, CA. Of all the head hunting groups I have used, this one hit 100% of the time when I made myself available. I was taken to lunch once a month, and paychecks were delivered onsite.
They use current developers in the technologies you have used to to a phone interview with you. The interviewer could be another consultant (such as myself... I made $50 for each delhpi/sql/blah technolgy...interview I performed..).
Having taken a full-time position, I have not used them for about three years.
My advice if you don't receive a response is to MAKE SURE YOUR QUALIFICATIONS meet their requirements.
Obviously I am a senior level candidate with tons of experience in multiple industries, and I can only account for the experiences I have had through contracts in VA, SC, TX and finally CA.
My success with multiple contracting companies is mostly based on this:
Remember every contact is a potential NEW FRIEND.
Be straightforward and honest... don't talk around the block, they already have your resume'
Don't burn ANY BRIDGES... you may need them in the future (You may be perfect for the next project they have).