Here's the final way of giving yourself your best chance of landing the job. Send a snail mail thank you note. Stop at a coffee shop, write the thank you note and mail it right away after the interview. You have no idea how much that simple courtesy will cause you to move up in the estimation of the human resources person you saw. If you don't hear from the company after 3 work days, call them (or have your search firm call them) and inquire as to the status of the opening. This will keep you in the forefront of their minds!
Finally, never underestimate the power of the temporary job. I have gotten 50% of the jobs I have held as a result of a temporary assignment. When on the temp job I work really hard, smile a lot and really pull my own weight and then some. And you get an idea of whether or not you really would like to work for the firm as well. A good attitude and a can do mindset can create marvelous good fortune.
Best of luck and good working in 2011!-