While I'm not downplaying Intel's newest chip (thanks to the benchmarks out there), while it would be nice to have a 4 logic core chip w/ Hyper-Threading for "8" cores, the software really needs to get it's shit in gear and I hope Windows is coded for a multi-core environment and I hope the 64bit advancements in Vista help make Windows 7 64-bit more well rounded.
Either way though, it's a neat thing and if you're getting a new PC, then go for the Nehelam, but for people like me.... I don't see the need for upgrading my Quad-Core for at least 4 years or so. GPU--- sure, but CPU? not so much.