Bradley talks about jumping onto the ultraportable train, so I thought I'd add a couple of cents.
For a couple of years now, I've wished I had something more amenable to note-taking at conferences that didn't involve wearing a groove into one of my shoulders. Not that my Powerbook is super-heavy, but add some books in there, and it borders on the inconvenient.
And so, I did a little research, and came up with the Nokia N800. It's got basic internet, a bare bones text program, and pairs up with a Bluetooth keyboard (unlike my iPhone, which has only the first of those three things right now). I was looking mainly for something I can stick in my bag quickly, carries a decent charge, and can use to take notes at a conference, outdoors at Panera, etc. And while they apparently don't make these anymore, Amazon still had some iGo Stowaway Bluetooth keyboards in stock. The driver comes preinstalled on the Nokia, and the two are bundled at Amazon. Made it pretty easy.
The whole thing set me back less than $300, which is a fair chunk of change, but which I'm hoping will be worth it in the medium run. To wit, I'm no longer thinking about getting an Air anytime soon. That I could get 6 or 7 of these Nokias for the price of a low end Air just sealed the deal.
Here's a couple of pics:
So far I'm pretty pleased.