They were still sold out at the Reston Apple Store on Thursday. By the way, I asked what the most popular model was. The guy thought about it, and I got the impression there wasn't one overwhelmingly obvious answer, but after consideration, he said 64gb 3g. I mention that in regards to the 16gb conspiracy theories 🙂
As someone said, stock that could be going to finishing off the U.S. pent-up demand and "now that it's launched" impulse buys is instead going into crates headed to London and elsewhere in Europe, so that launch will be adequately supported. Same reason the wifi model was hard to find before 3g launched here. Apple's suppliers can build a finite number of models, and it doesn't matter what capacity they are, if they're 3g or wifi, and if they're U.S. or Euro. The bottlenecks are number of production lines, and number of screens. Once pent-up demand is satisfied, I think they'll be able to keep up with demand just fine even if it continues to sell briskly.