While it may not be considered by most as a "startup" at this point, I think that in the long run Wikipedia will have a major impact on education, in the sense

While it may not be considered by most as a "startup" at this point, I think that in the long run Wikipedia will have a major impact on education, in the sense of the knowledge base of the average individual. I can't quantify the amount I've learned from wikipedia articles over the years, but I'm quite certain it's an awful lot. If I had grown up with access to it I'm pretty sure the impact would be far greater. Sure, when I was a kid we had an encyclopedia, but A) a lot of kids don't, and B) wikipedia is thousands of times more powerful than an encyclopedia (and reading one article will often lead one down a path through various other articles too). Is it going to replace public schools? Obviously not. But it has and will change education for the better.