That Mandelbrot zoomer is pretty much finished now. Has a Julia mode and it's all pretty damn cool.
Using shaders makes it work in real time. To get the same level of detail from the CPU you're looking at >10 second render times. Unfortunately I've no ATI card to test it on so I'm unsure whether there's any issues with it in that respect. Also need to test it under Linux some time (it should run under mono without any changes, but I've not checked that).
As I say with the audio game I keep hitting problems with it, which is annoying. I'm unsure whether I'll finish it right now. I'd like to but I'm completely unsure why the enemies are whizzing off at obscene angles. It's a pretty huge bug (you can't see it in the video, but it reduces the traffic count significantly and caused a ton of problems when I added multi-coloured enemies). Bleh.
The space game I got to an almost playable level then realised I would have to make too many translations per object for the collision detection and the entire co-ordinate system would need reworking, so I left it. Idea now is to go back and rework it properly from scratch with some updated graphics. It's based on an old game I used to play under RISC OS but I lost many moons ago. I remember all the gameplay elements though, so recreating it isn't an issue. Lot of fun, used to play it for hours at a time.