Guys I'm pretty sure you could use 'RapidFreeTraffic' for this.
RapidFreeTraffic had 2 basic elements (when I tried it anyways, a while back now though):
1) You pay a sub and you can submit articles to RapidFreeTraffic's members own sites (can you see where this is going?)
2) For free you can submit your sites to the network so people will post their articles to it
You'll find it in g but I think that you have to hit the 'add to cart' on their sales page and then cancel out to and go through the pop ups to get the original price down to a free trial - once you're in the system you can submit your sites for free.
Anyways - someone needs to test this as I tried it a few months back now and I only used the paid sub to post my articles but if the 'submitting your sites for free' thing still exists then it should work nicely
Wannabie - nice share