We use it for Stylous: http://stylous.com/ http://stylous.com/ Io is by far my favorite language. Steve did a fantastic job of removing everything that isn't

We use it for Stylous: http://stylous.com/ http://stylous.com/ Io is by far my favorite language. Steve did a fantastic job of removing everything that isn't necessary from OO, leaving a simple and powerful language. The downside of using Io is that you'll end up writing a lot of libraries yourself, since there isn't a large community yet.