YC, Techstars (in Boulder and Boston), Launchbox, Seedcamp, Alphalab, Shotput, Dreamit, NYC Seed, Capital Factory, Awesome Inc, Bootup Labs, Lightspeed Summer Grants, Summer@Highland, Founders Co-Op, Flow Ventures, Gangplank HQ Incubator. Also iVentures10, but they come with a strong unrecommendation from an anonymous YC commenter.

I didn't include some of the funds at the periphery, like CRV Quickstart and fbFund. There's also the Plug and Play Tech Center in Sunnyvale, just about the only true tech incubator left in the Bay Area.

I'm pretty sure YC doesn't have anything to fear. They will likely get the cream of the crop (according to their standards) since the program is well-established, is in the startup capital, and is lead by someone who has provided a wealth of resources on startups. YC is like the Harvard of seed funding programs: few people would turn it down if accepted.

You mean something like this? http://www.firstascentventures.com/blog/?p=26