This is the i7 920 CPU chip. Its the D0 version (latest one), which runs cooler and can be overclocked further.
Become a member of the forums to get free delivery, which brings this CPU to 234.59
Its a great priced chip, a perfect upgrade, especially with the current promotion for the GTX 275. In fact if you have the cash, it would be worth going for the complete bundle that is also on offer.
I would recommend getting the bundle here. The other bundles have slower ram or pricer ram with no benefits.