Dan we are looking at vaporware till it ships, which it hasn't and won't for at least 9 months. Improvement it may be (still to be proved) but it adds an absent feature to the Mac OS that has been on Windows for a long time for users to use warts and all. From previous experience, Apple's demos should be taken with a large grain of salt.
PCAuthority recently compared Vista (not shipping) to Tiger (out almost 2 years). I pointed out that was a fraudulent comparison. But then why let balance get in the way of stoking your readership's prejudices?
My specs on comparable systems were:
Mac Pro 2 3Ghz Dual Core Xeon, 1Gb Ram, 250 Gb Serial ATA HD, NVIDIA Quadro FX 4500 512Mb GPU, 1 Superdrive, Apple keyboard & mouse + Applecare A$8456
Alienware MJ-12 7550i 3Ghz Dual Core Xeon, 1Gb Ram, 250 Gb Serial ATA HD, NVIDIA Quadro FX 4400 512Mb GPU, Acoustic Dampening Case, 1 Floppy, 1 LG Double Layer 16x DVD+/- RW/RAM, No Modem, Gigabit Ethernet, 3 port 800 FW, keyboard & mouse, 3 yr warranty A$6116
On the Australian site these were the closest configs. I had to upgrade the Mac's GPU because Alienware didn't have lower end GPUs close to the cheaper Mac options. The Alienware optical drive supports RAM which the Mac's does not. It has 3 external bays including a floppy or media reader, but seems to have less USB & FW ports (hard to tell from the description). Also I couldn't find provision for a 64 bit Windows, this just had Windows XP pro 32bit.
I noticed that Alienware's Xeon processors range up to 3.6Ghz where the Macs top out at 3.0Ghz. Also you can have hot-swapable HDs in the 4 internal bays, and if you order on-line you get a Free Alienware mousepad worth $20