I'll tell you the same thing I told Shawn when he was looking....
I do on site service for Dell, Compaq, HP, Gateway, etc. Everything, laptops, servers, desktops, plasma TV's, printers, etc..
In a nut shell, I feel the best made laptop is IBM. However, their customer service and support is the worst in the business. Toshiba makes a good one, too...Unsure on their service and support (mine never broke). HP, Compaq, Gateway all have junk and their service and support is almost as bad as IBM's. Dell makes a great laptop, low cost and, in my opinion, has the best service and support in the industry. If something breaks, you call them and the next morning someone is at your house replacing the part. You can't beat that. Dell offers a service contract called complete care (I think) that is a no questions asked service plan. Basically if you spill a coke in your laptop and fry it, I'm there the next day replacing it. If you drive over it in your truck, I'm there the next day replacing it. If you simply don't like the scratches on the screen or case or the lettering on the keyboard is worn, I'm there the next day replacing it.
This is literal to.. I got a call from a guy that forgot his laptop on top of his Suburban. When he pulled out to go to work, he saw it fall on the ground. Rather than stopping, getting out and picking it up, he drove back into the garage - all the while running it over. He called Dell that morning and the next morning I was out with several boxes to fix it. When I arrived on site, he had it hooked up to an external monitor, keyboard and mouse and was using it. I literally replaced everything on his computer except screws and hard drive. No questions asked, nothing for him to sign and at absolutely no charge.
The Intel Pentium M processors are sweet! A 2GHz P4-M will benchmark at the same speed as a 3GHz P4! The newer processors (Centrino and Pentium M) are also load sensitive. Meaning that when your computer is doing easy stuff, like surfing the web, the speed on the processor is at 600 Mhz. Doing so keeps the heat down and uses less battery. Since the heat is down, the heatsink will take the heat out of the processor without ever turning the fan on, which increases battery life even more. But when you are doing something more intensive, the processor will automatically kick into high gear and operate at full speed. Then after you are done, it will throttle back down to 600 Mhz.
Wireless... Dell has pretty much used the same wireless card for the past 4? years or so. They are made by Intel. They've gotten better with the antennaes. Used to be they had one or two and it was in the base of the computer. Range was fairly limited to the same side of the house. Now they have the antennaes up in the top of the screen, making their range much much better.