If I had to recommend a tablet PC today, the HP EliteBook 2740p Tablet PC would be one that I would highly recommend. Even though I currently use a Lenovo ThinkPad X200 Tablet PC, there are some features found on the HP 2740p that I'd really like to have. You see, I do a lot of typing at night and I need to use a USB-powered LED light so that I can see my keyboard. I keep my screen brightness on low so that I don't disrupt my wife.
The HP 2740p has a really nice little pop-out LED light at the top of the screen. This light effectively illuminates the keyboard and works really well. So, whether you're on a plane or in a dark radiology suite, you won't have any problems seeing your keyboard.
The other nice feature about the 2740p is that the keyboard isn't so loud. This year, I did a bit of traveling to attend some national meetings like HIMSS, the Association of MD/MBA Programs, and the American College of Physician Executives (ACPE). When I'm in the room typing away, it's disruptive because they keyboard on my ThinkPad is rather loud (I don't like to be obnoxious). I think I need a travel notebook that has a softer keyboard. Maybe I should just get a MacBook Air. That will solve both of my issues: illuminated keyboard and soft keyboard.