Testing all versions of IE, and almost enjoying it at the same time.
Testing web pages in multiple versions of IE is the part of my work that makes me wish I had geared my career towards toilet cleaning. Recently I discovered this little gem: IE Tester .

This makes testing different versions of IE a breeze, and you can easily see how crappy your pages look in IE6.
Enjoy!
IE Tester is about the best thing to happen to Internet Explorer since… anything?
I’ve been using it for a while and find it extremely helpful for testing IE6. It is fun to see how badly sites are broken in IE5.5 though.
IETester is not 100% solution … thare are bugs that it ignores and native IE6 displays.
The best solution on Windows XP is MultipleIE with it’s native rendering engines or on Windows 7’s XP mode with installed IE6 and IE7
@Marek: Do you mean the “known limitations” posted on the IETester webpage? If not, could you share some information on what type of bugs you have found. Do you have a live test case where IE6 and IETester differ?
If the IETester rendering engine can’t mimic IE6 then this tool is not as useful as I’d thought…
@Mats: Unfortunately not, because going production has to be working in native browsers. We had several issues with positioning, styles, scripts.
Exactly as you say … it mimics IE6, it can be used as a guide, if there is something terribly wrong, however before going public, definately must be checked in native browser.
I’d also love to hear what issues you’re seeing. We do some basic support on IE6 for legacy users, and IE Tester sees each bug that is reported to us. I have yet to see anything (again, my experience) that IE Tester has missed for IE6.
Have you tried xenocode yet?http://www.xenocode.com/browsers/
This supports a lot of versions for different browsers and runs them virtually from your box. It really helps me in cross browser testing