Well, these are some interesting results; I'm glad to see that someone's actually managed to hack a BIOS to run SLi; personally, I've been rather annoyed at nVidia's attitude when it comes to SLi support; I don't like these "exclusive" sentiments. with luck, perhaps we just might see motherboards in the future that support both CrossFire and SLi at the same time. (as well as S3's "ChromeVision")
However, I must say that the performance difference suprised me. I never thought that a third-party hack could come so close. Also, I'm suprised that performance in non-graphics tests were more or less identical; I had previously seen the nForce chipset as the all-around most powerful one to be had; I guess this only applies to gaming and other graphics-intensive tasks.
Of course, this sort of solution is not for everyone; the biggest one, of course, is what Heyyou27 pointed out; it's a higher proprietary, cobble-together solution. As such, compatability is iffy at best; you must use a certain (far from current) ForceWare driver, and you lose out on a number of modern features, including support for a number of modern games. However, from the point of view of a true hardware enthusiast, this is exciting news; this may mean future updates that would actually benefit the "average" gamer thinking about dual-GPU rigs.
[edit]Is it just me, or is it that most front-page article threads wind up in the "Memory" section for no apparent reason? I'm really interested to know why this keeps happening...