It doesn't impress me much
Nope. I don't think this core is that much better than Northwood really. The one thing that stands out to me is that they've doubled the L2 cache size, which Intel has historicly undersized they're L2 cache sizes, and that makes this pattern even more obvious at least to me when it comes to that- when a chip maker needs a quick speed boost to hold on for a bit until they're real improvements come in they do this. Motorola did it when they knew they weren't going to be able to come with drastic clock speed increases and added the L3 cache. When Intel pushed the northwood P4 to 3Ghz, AMD responded with the Barton core in there Athlon XP/MP chips to compensate until Opteron/Athlon 64 came out, which most notably included a bigger on-die L2 cache and a slightly faster clock. Intel has been quiet, sure all Intel seems to know how to really do is crank the Ghz through the roof, but it's becoming obvious with AMD holding pace performance wise and sitting at a mere 2.2Ghz, and IBM staying in the game at only 2Ghz (come on IBM I wanna see 2.6Ghz!!!), that they need something more than a couple hundred Mhz to stay on top of things. I think Intel is thinking really hard on what to do, and Prescott is just a time buyer.
And even at that, when Intel comes up with something decent, it could be just another thing like ooh remember that chip they make for servers.. ooh yeah Itanium... (aka underperforming power hog, or hey at least it keeps the room warm...)