I have Radeon HD 2600 XT and I've searched a lot how to put it in use, and the only thing close to working was a demo of WebGL hashing. The demo wasn't working for me, though in theory it should work on every card with WebGL (OpenGL 2.0) support (Radeon 9500 and up).

Probably, but there's a possibility it's for a scientific calculations (Folding@home, SETI@home etc.)

Hi, I'm metal03326. I'm mining for almost a month now and I'm an addict
I started with and old Celeron @ 2.2 GHz laptop and an Athlon X2 3800+ @ 2.0 GHz. Then I clocked them to 2.8 and 2.4 respectively. Then I got another PC (for free) with Core 2 dou E7400 and OC'ed it too. After that I bought nettop to replace my X2. The nettop have Radeon 6310, which is capable for mining. My latest addition is a PC with Phenom X6 1090T Black Edition (OC'ed it of course ) and Radeon 6770 (overclocked it with BIOS reflash). My next challenge is to find 2x5830 and put then in the X2 PC, as its motherboard has 2 PCI-E slots. But it's hard to find 5830 these days