It's not open source, of course, but I find the gathering momentum toward opening up APIs in Web 2.0 applications to be an interesting spin on the "offline" open source world. First it was Facebook, and now it's LinkedIn. In the web world, it's not source code that gets opened (though these properties could do this and, in my mind, should), but rather APIs.
As to why companies are opening up the web, it has nothing to do with charity. It's actually very similar to the offline software world where you can put … Read more