Ad revenue

Hi,
I am opening up a law website (Find a solicitor, Compare Client Reviews and Solicitors Ratings) to advertising, I am getting around £100 in adsence a month but think i could do better direct to solicitors? The site is getting around 5000 uniques but 20,000+ page views/ month
Does anyone know an off the shelf management system to control the ads? (there are around 5,000 pages!)
Thanks,
David

Open source, free software:
http://www.openx.org/publisher/open-source-ad-server

Closed source, commercial service:
Online Advertising Marketplace | BuySellAds.com

The best place would be Buysellads.com

And how, exactly, did you conclude that this is the best solution for him, as opposed to just one possibility for him to consider against his business requirements?

£100 for 20k pageviews… i would keep to google, and work on get more traffic. Its that simple!