John,
We provide T42's to our employees where I work. Most of them do quite a bit of travel and these work-horses have gotten only positive reviews.
The Wireless NIC is easy to configure, using the just the Properties dialog window. The screen is good size, suitable for several apps open at once. The people using these things are typically running a spreadsheets, powerpoint presentations, VPN connections into the bank from remote locations, and browser based applications providing banking information. Several also run different versions of Bloomberg, i.e., installed version and the web based version.
Nice machines. Wouldn't mind having one of my own. Just don't have the need for another laptop.
Randy