I recently decided to do another Google search for my name and came across an old post about a new cairo gtk widget called Fittsmenu. I had some complaints about it, but, overall, it's a really cool implementation of a concept for a radial menu. After doing some more hunting I found out that it's now in a thing called libsexier being hosted by codethink.
I'm mostly writing this post to remind myself about this project because I'd like to pick it up and play with it. It looks like nobody's actually messed with it since 2007 and I still wonder if I can fix the radial rotation to my liking. I'm also curious about how well sub menus can work by layering them in successive rows.