Edit: However Zenedy's description was very good and there seem to have a real potential.
And although I'll regret being negative myself I will just say - Zenedy, really? I think if wanted to write a startup style description of a affiliate marketing site that'd be it.
As for Zenedy. I think they are following the Demand Media model, and that has proven to be a business that generates a lot of money.
Do not discount affiliate marketers. If you look at startups that operate affiliate businesses they tend to become quickly profitable (frugalmechanic, ticketstumbler etc..)
There's nothing wrong with affiliate marketing, I'm just a little surprised to see the YC funding the old "pick area, get low quality freelance content, build search rank, sell affiliates" model.
Also, a bunch of these startups are still under embargo so they aren't even being written about. Give it a year or so and then start complaining.