Update: Forget Wine. Virtualbox from Sun is free and far superior. You can run Ie6, Ie7, Ie8. You’ll need to go to the following page and follow the instructions. It’s important that you read down the comments to get everything set up as needed.
If you get a blue screen of death on start up you will need to start safe mode by (frantically) hitting F8 at Windows boot and choosing safe mode. Once in safe mode run regedit and change Start value to ‘4’ for the following then restart windows:
How to install and run Ie6 on Internet Explorer on Ubuntu Ibex with Wine Tricks.
sudo apt-get install wine
sudo apt-get install cabextract
sh winetricks ie6
To run Ie6:
wine ~/.wine/drive_c/Program\ Files/Internet\ Explorer/iexplore.exe