I had been playing around with making a little video game that makes use of 3D glasses, and I sort of ran out of steam on it so I thought I'd post up what I had. It's more of a proof of concept than a full game.
It's just a regular side-scrolling platformer, but in addition you can use the up and down keys to move back and forth along the z-axis. With red/cyan anaglyph glasses on, you should be able to distinguish between solid blocks, spikes, and enemies that are at different depths, and plot your course appropriately.
I made it in the free version of Game Maker, which was super easy and fun. The full version might allow you to alter the low-level rendering routines to do the anaglyph offset at runtime, but I just made different versions of each sprite for the different depth levels and switched between them.
I was already playing with this stuff when I read about Kokoromi's Gamma 3D contest. Really interested to see what people come up with.
Anyway, here's the download link for Welder Wait 3D. The archive includes the Windows executable (Game Maker is Windows-only) and the Game Maker "source" file.