Anyone doing web design or development on a windows box will likely appreciate this - A simple way to not only install IE in linux, but install several versions and with common plugins to boot.
IEs4Linux allows you to easily install IE6, IE5.5, and IE5 on any linux computer - there are distro-specific instructions for Ubuntu, Fedora, Gentoo, Debian, Suse, Mandriva, but basically you just need to make sure you have cabextract, wine, and then run the provided installer. After asking a few questions it downloads everything and drops some binaries in a ~/bin folder.
If you are feeling adventurous there is a beta version which supports IE7. Since IE7 will not run in wine, there is some hackery going on, but thankfully it's dealt with for you. A nice side effect of this system is that you can run multiple version of IE at the same time - something that's not easy (possible?) to do in Windows.
