Good concept and I would suggest the following:

(1) Instead of all those messy listings you should have a GIANT search box right in the middle a-la google.

(2) Drop the categories. Work on your search algorithms instead.

(3) Make it much easier for visitors to identify themselves right on the front page: freelancer, employer, curious person, etc

(4) Write down top 3 reasons for why you are different from craigslist or jobster. Make those reasons obvious and apparent on your front page.

Good luck!