mack - 1:38 pm on Sep 18, 2009 (gmt 0)

I think the software you need will almost certainly be custom. Have the software designed to meet your business needs, not the other way round.

The major hurdle I see is getting publishers and advertisers. You can't have one without the other.

I imagine you may need to invest quite a lot to pay publishers to promote your service, whilst attracting paying advertisers.

Mack.