Microsoft Office on Ubuntu
Well, I am quite impressed. Microsoft Office 2003 installed perfectly on Ubuntu using Wine 1.01. I would use OpenOffice or AbiWord (and I do, for some things), but their limited compatibility with Microsoft Office means that I can never quite trust formatting. I now have three installs of the same version of Office on this machine.
I followed these instructions, although I had to use "wine setup.exe" rather than "wine autorun.exe". The instructions are trivial, though: navigate to media/cdrom0 (or appropriate media/* location for the drive), and run "wine setup.exe" (see above). I left the file associations with OpenOffice, because it's trivial to "Open with > Wine Windows Program Loader".
Linux is more and more a viable alternative to Windows. Eventually it may be more useful, because of being able to run both Windows and Linux programs. Go open source!