I use one of these for some daily office stuff including printing shipping labels. I also sometimes use it to run an old EPROM programmer.
They're very nicely designed machines. They're a great example of Compaq design right at the end of the company's life, before they were taken over by HP.
I've run into a weird BSOD problem on mine which consistently occurs when Firefox 5.0 visits some web sites. I found some discussion about it online where the Win2k OS and either Java or Flash (can't remember which) were called out as factors. I didn't see any resolution given, but I'm fairly convinced it's software and not hardware.
I've thought about upgrading the video to a passive 8400GS or a Radeon 9250 PCI which I have handy, but I'm not sure how well it would dissipate the heat.