Personally, I had a few IBM thinkpads which were pretty solid - one (380ED) is still with me - it was my Dad's for a few years, i'm going to clean it up and it'll be my Mum's simple word processor and email appliance.
I then had a Dell Latty C610, nice, but a bit flimsy. The Latitude got replaced relatively recently with a Sony TX2/XP which has an awesome screen, and best of I don't need to carry tons of adaptors, and can often leave charger behind. My laptops don't often leave home, so the relative flimsiness of the TX2 doesn't matter - they get moved around the house depending on what I'm doing.
At work I often didn't have a laptop, a few years ago I gained a cast-off Dell Inspiron 5000 which was a huge chunky solid thing, and it was really robust. Then I had a Dell D400 and D410, neither of which were particularly nice. Changed job in June, got a MacBookPro, lived with OSX for a few months but found Linux was more useful for my tasks, passed off the MBP to a new guy and ended up with a Tosh Tecra M9 (with discrete Nvidia graphics) mainly runs linux, very rarely Vista for specific tasks . We also have Lenovo's at work but a few problems with them meant we decided to try a different brand. A colleague has a Tosh R500 and I'd probably buy one of those instead of a Sony TX/TZ as it feels more solid.
--edit - clean up.