AMD Bulldozer is here, oops!

[Rattlehead]

Just to add, the problem with multithreading is that for games, four cores is as much as you'll ever need for the next two, maybe three years. Maybe even longer.
There are some games that apparently run a tad better utilising six cores, but the vast majority don't need more than four to run as smooth as silk.

Eight cores? Only if you're heavily into certain mutlithreaded applications (ie. not games) will six cores or more make a difference. For games, it''s basically a waste of time...this is especially true since more than half of PC games are mutliplatform games, meaning that they're also developed with the ancient console architecture in mind.
No developer with half a brain is going to specially bring out a special PC version of that game; it's too costly for very little return. And no game developer at present is going to optimise a game to use eight cores, much for the same reason.

In about 2014 I'll look around for a replacement for my 2500k, but for the next few years, aside from a GPU upgrade, I'm not spending another cent on my machine.