I'm a big fan of tangentstorm. I have been playing with J for years, and every time I experience a lull in my J pursuits, Michal comes out with some great video on or using J. I highly recommend watching his YouTube stuff, and checking out his github page. He just put together j-kvm. A keyboard, video, and mouse driver for J [1]. He uses this for the editor work in J.
[1] https://github.com/tangentstorm/j-kvm