That's a good link -- lots of real world testing.

However, I came up with a different conclusion from it than you did. The conclusion I got from it was that "the 2600 mAh Ultrafire cells I've been getting from DX for $4 each are pretty good". Sure, they measured them at 80% actual capacity, but most of the other cells weren't much better but cost a lot more.

To me, this says to avoid the 3000 mAh rated and larger Ultrafires. I'm surprised that they'd really cut open old laptop packs and make crappy batteries from them, but the evidence seems pretty strong. But my experience with the 2600 mAh batteries is very good, and this page seems to confirm it.