You've probably seen all those mIRC llamas using 'moo.dll' to spam loads of info about their system, well here's a perl script that can do the same on any modern Linux system. It is Linux specific as it makes a lot of use of /proc, so don't try this on a BSD folks!
Current version is sysinfo-0.16, posted at Fri Jan 7 13:52:35 GMT 2005. Note that old versions are still available if you change the version number in the preceding URL, but they're only really of use for historical interest.
If you want to see what's changed, check the end of the script, it contains a changelog. Also there's a --help option now to show all available options.