Just download Microsoft virtual  pc which is free app. and download the xp IE 6 image (which is free too ) and use IE 6 and IE 8 at the same system.  It’s very use full for  vista users.

I have XP vmware images , which I created,  requires to have xp licences etc but this is free and work really well. I still think the windows 7 xp mode is cool but this is next best thing