than testing the layout in ie6?

But to use IE6 to test in IE6 did you try?
Portable IE6 download for example from here:
\rtorwald.ru/72/portable-%D0%B2%D0%B5%D1%80%D1%81%D0%B8%D0%B8-%D0%BE%D1%81%D0%BD%D0%BE%D0%B2%D0%BD%D1%8B%D1%85-%D0%B1%D1%80%D0%B0%D1%83%D0%B7%D0%B5%D1%80%D0%BE%D0%B2/

You can still a virtual machine to run in them to test in any browser, the main thing is to have enough RAM

I Use IETester . In General, you need from IE 6 to refuse, as did Google.

The V-world with Вин2000. There IE6.

There's such a build for VPC
\rwww.microsoft.com/downloads/en/details.aspx?FamilyId=21EABB90-958F-4B64-B5F1-73D0A413C8EF&displaylang=en
\r
IE is wrong to test nor in the modes of the other versions, no special software, because bugs each version is unique.
But fast of course you can :)

The ideal option is a laptop with WinXP and all the consequences:)
\r
The most reliable compromise — a clean WinXP in virtual reality. Virtual box is able to integrate seamlessly, just like a window. However, you need to utility at least 512MB memory virtual reality to be at least minimally comfortable.
On Macs there are wonderful Parallels.
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Everything else is just not able to reproduce a broad range of glitches, bugs and crashes inherent only in IE6, in all its pristine glory:)

That's great service
\r
\rhttp://spoon.net/browsers/
\r
Allows you to run different versions of IE, FireFox, Chrome, Opera, Safari