As I have noted many times, the standalone Internet Explorer implementations are hacks that are best avoided. Alex Russell, leader of the Dojo project, explains the reasons quite eloquently. The recommended practice is to use Microsoft Virtual PC to run IE6 in a virtual environment. Which, for some, was a bit of an issue as it required another license for Windows–not everyone is blessed with an MSDN subscription.
Microsoft has recognized the issue and has released a free Virtual PC image for IE6 compatibility testing. Go here for the announcement or just get the image here. Enjoy!