Do you run 64bit code?
I haven't had any need for that.
Maybe some software will be able to use those new SSE's in the future...
But when the computer has 32bit motherboard and memory limits, I wouldn't call it a real 64bit.
Well, in that case, there's no 64bit systems in existance, 'cause even the "64bit" processors usually only support ~40bits of address space
Beyond that, given few people have more than 2GB on systems that take more, I don't see that as an issue.
Do I run 64bit code? Which system?

(I'm a geek. I've owned a Digital Alpha box for almost a decade... got old Sun hardware too...)
64bit registers, and twice as many of 'em, with support for said hardware expected in Leopard tho, yeah, I can go for that. If you want the pure consumer view as of right now (as opposed to the long term view), fair enough.
The SSE stuff is useful now. It's not "new SSE", it's "current SSE but up to twice as fast". The older systems had a 64bit path through the CPU to the (128bit wide) SSE units, so loading 128bit registers took 2 cycles. They doubled those paths to 128bit. So, it benefits code already written. I consider that a major win.
Didn't that MBP revision also add FW800? I know they improved the RAM and HD size, boosted the clock speeds, and I think they upped the write-speed on the DVDRW drive too...
Reading that thread you gave link to us really made me think if I want mbp after all... 6bit display, banding problems, etc., ...
Now if they reduce the gamut to something like cheapest television in the 70s with white led backlight I will be sorry that I bought FinalCut...
6bit/color (ie 18bit/pixel) is what you get in laptops. Check the PC world. I don't want to say "all", but I've seen a lot of laptop panel specs in recent times, and they were all of the 18bit variety.
Having said that, you know the standard proviso with Rev A hardware from Apple -- it's only for the brave or the foolhardy
Right now, I'd choose wide gamut ccfl even if it dims over the time and I don't understand why Apple wouldn't give option to choose the display (led or wide ccfl) BTO like they offer now matt or glossy panel.
Hold your horses, old chap! You don't even know if Apple IS offering LED yet, nor what the specs for that panel are!
The 45% gamut stuff is for that particular panel, not an inherent limitation on LED. You can get more accurate color representation with LED than with CCFL, with quite a number of existing (and on sale right now) displays being specced at 110% NTSC. I've seen a Philips panels somewhere that was ~135% NTSC. However, better costs more.
The other advantages of LED are that it uses less power, it's lighter, it's thinner, it's more even, it's harder to break... For the majority of us, that's a win.
Remember tho', laptop displays are always a compromise between quality, weight and cost. C'est la vie.