I've spent the past month focused mainly on Intermorphic's Audio/MIDI visualizer framework, dusting-down the work I did (in the main) several years ago, and bringing it all up-to-date.
I've recently experimented with lots of stuff, 2D and 3D, on iOS (UIKit ,Quartz, Core Animation and OpenGL ES) and Android (Canvas and OpenGL ES), and have learned a lot about performance differences between these approaches. I've also learned that OpenGL ES is a truly horrible API in which to get things done. :)
Anyways - things are coming on nicely: the next update for Mixtikl should be another good one!