Use Multiple IE versions in Windows

Wanna test websites on IE 5.5 (bad CSS bugs) while continue using IE 6?
Go here:
Also note that the Developer Edition of IE6 which lets you test the “flash prompt” (lawsuit about plug-ins, search around, it’s all here in News & Random…) installs side by side with your normal IE, so you can easily test the workarounds developped so far in this new IE6 version…which is still beta tho’
Hope this helps.