There was a discussion about it here a few days ago. I don't have any actual proof, but my guess would be it's some sort of IE6 bug. I don't notice a thing with Firefox 2.0RC3, aside from the annoying rendering errors from Cnet's inability to properly leverage cascading style sheets.
I think the basic answer to your question is that things are still a work in progress. I'm not sure what Cnet management is thinking, rolling out half-baked solutions like this, and expecting people to just suffer through all the development teething. Makes much more sense to me, that the developers would have a few isolated servers that they could use to work out all the major bugs, then transfer them all to the main servers. Until now, I just always took it for granted that this was common sense for something on this scale.
Anyway, I better stop before I really start ranting about blunders being made that a true technology leader, like Cnet tries to convince people it is, shouldn't be making. If you want to complain, for all the good it will do you, you can head over to the forum feedback forum, and there's a discussion ongoing over there about the new look.
I don't know if anyone else is having this problem, or if it's just me. It seems as tho since they "improved" CNet, my scrolling is very jerky. The only place this happens is on CNet. Is it just me?? Maggie