I've been wondering the same thing. I ordered a 120GB/XP model from JR.com for $323 after Microsoft Live Cashback (when it was 15%. now it's 6% or something). But it's been nearly a week and it still hasn't shipped. I have a bad feeling they're going to cancel it.
I missed out on the only batch they had at Best Buy. And it doesn't seem like they'll ever get any new ones in store or online. It's a shame too because I have a $50 Best Buy gift card ready to go.
Some of the Circuit City stores here have the 8GB Linux version, but I want the XP version since I'll be dumping photos onto it when I go on vacation in a few weeks. I'm glad that they at least had a floor sample to play with. Now I know without a doubt that the keyboard is a perfect fit for that size -- unlike the EEE (forget about touch typing) or the Dell Mini.