I have an IBM Thinkpad. Very good, very rugged, just marvellous.
I also have a Dell Inspiron, which I have to say is of ultra poor quality. It is cheap, but there are a lot of compromises. The entire machine is fragile. So are the buttons, press the power buton, and sometimes works only on the second push from power off state. Overall, very vewry poor quality. THeir TV commercials lie about quality. I had to return it 3 times back to Dell, each time because of a motherboard failure. It finally worked on the 4th time. Still, it feels fragile, and the keyboard keys feel not good. Overall, they are a good deal, but I would never get one is data and reliability is so important. A lot of people I know have dumped their Dell laptops for IBM, COmpaq, Toshiba, Fujitsu, Sony, and some of the other brands. So, never will I buy a Dell laptop. BUT, they make some of the best DESKTOP's, and thatis one area where they are very strong.
I also like Toshiba's and Sony's. The Sony's look very beautiful. The Fujitsu ones are very nice too.