When I installed Ubuntu on my desktop, everything seemed to "just work" -- I used the proprietary ATI graphics card for my ATI Radeon HD 5870 and everything from Compiz to video to Amagetron Advanced worked perfectly fine.
Then I tried Minecraft. It crashes when rendering the levels, and Googling the error message shows it to be a common issue with (well, bug in) the proprietary ATI drivers. So, I tried disabling them -- and my entire desktop started flickering, Compiz exploded, and basically it was just Not Good.
I spent about $100 on this graphics card (last year), so I'd prefer to not pay for a new one if possible. On IRC, I've been told that "ATI sucks with Linux, your fault for buying a shitty card" and similar. I was hoping that Linux (especially Ubuntu) had gotten over the driver-hell as it had for the rest of my system -- is there a working, open-source ATI driver being developed?