Here's one I got recently that I'm really loving:
It's a Dell Inspiron 4150 (also sold as the Latitude C640). I love my old Dells 😀
It has a 1.7GHz Pentium 4M, ATi Radeon 7500 16MB graphics, the optional 1400 x 1050 display (came standard with a 1024 x 768 display), the original 30GB hard drive, and I just upgraded it to 1GB of RAM yesterday. It also had the original Dell TrueMobile 1180 wireless card in it (which you can actually see sitting under those two sticks of RAM to the left on my IBM XT!), but it only supported WEP security, so I upgraded that to a newer card with WPA2 support.
I can tell this laptop has definitely been used quite a bit, but not abused. It's got some scratches, and wear on the keyboard, but nothing I'm too worried about. You can actually still get NOS keyboards for these, so I may get one of those.
This machine is the little brother to the Inspiron 8200 (which I also have, and love). The Inspiron 8200 is a larger, desktop-replacement-class machine,while the 4150 is a smaller, lighter machine, with not quite the graphics power of the 8200.
It's a very nice little Windows XP machine. One really cool thing about the Inspiron 4150/Latitude C640 is that they can run Windows 98! Dell actually offered 98 drivers for these. A Pentium 4M would make a super fast Windows 98 machine.
It has a Windows XP Home Edition COA on it, but I decided to put XP Pro on it. I may get a bigger hard drive for it and dual-boot 98/XP or 2000/XP on it. Hell, I might even upgrade the RAM to 2GB and try Windows Vista or 7 on it! I've actually got Vista on my Inspiron 5100 (which uses a desktop Pentium 4), and it runs fine.
I need to sit all of my old Dell laptops out and get a family photo. I've got quite a few now! I've also got one on the way that I've been wanting for almost a decade, and am super exited about! I'll post pics when I get it.