How about this for a blog network idea. Basically I register a bunch of domains related to whatever the niche is. I'd have a blog for each niche like finance, insurance, games etc etc etc. Each blog would work similar to an article submission site but in blog format. Users would submit their blog post and assuming its not spam, off topic or duplicate content then it would go straight to the front page. To encourage people to actually submit content I would allow do-follow backlinks. To submit the content you would go to a different site, that way the blog network doesn't appear to be like an article directory or something like that. It just appears to be your average everyday blog. I could maybe make this site invite only. In the end, my blog networks would get unique content and the people submitting content would get relevant do follow backlinks. Win-win situation.