Remember that this isn't an incubator, so a lot of them aren't making startups. For example, Dale Stephens is doing http://www.uncollege.org/ (Organization aimed at promoting lifelong learning through "bootcamps") and Laura Deming is doing http://longevity.vc/ (VC firm aimed at funding companies trying to solve aging)

I know of a couple of exits, but I'm not actually sure which are public so I'm trying to find articles.

Some of my favorite current projects are Charlie Stigler (http://www.zaption.com/), Dylan Field (http://figma.com/) <-- Look at TC coverage to see what they are making, and Clay Allsopp (http://usepropeller.com/)

Again, the Fellowship is not an accelerator, so judging it based off successful exits is a terrible criteria.