I'm one of these. Typing right now on a small folding Bluetooth keyboard I bought about three years ago for my late, great Treo, now retired to whatever part of heaven is reserved for ancient technology. And the keyboard is paired with the phone that will stop traffic in about seven hours, and is right this minute responsible for a big swath of Broadway turning into a concrete campground as fellow geeks (slightly more nuts than I) salivate until the Apple Store opens at 7AM. Fate smiled on me two weeks ago via the online ordering process, so my iPhone4 came via FedEx this morning in a box tiny enough to camouflage its ability to create world peace or plug the oil spill in the Gulf, as you might assume it could do if you were from Mars and read the breathless forum posts on Mac blogs this week.
I went to the gym this evening and disguised it in my old, beaten-up 3G case lest some crazed fanboy notice and, well, salivate. But I was nervous just the same.
Postscript: Wrote this last night on the phone and am editing and posting this morning on my computer thanks to Evernote, a very cool app that can create, share, and update documents between either place. There are other ways to do this, but none so easy and seamless.