So Y Combinator, a start up incubator is launching 63 companies into the world today, the most in its history. What is it? It’s a way for start up companies to get the time and funding to ready their ideas and tech for demos with investors. They’ve helped get sites like Dropbox, Posterous, and Reddit up on their feet. So if you want to check out some of the web’s next services from the beginning, now’s your chance.

Check out the list of sites and brief descriptions over on All Things D.