We all know that the bane of web design is IE 6. I stumbled on this really awesome site this morning.
Kronenberg.org

They have an IE 6 emulation that runs via Wine. Wine is a software that allows for Windows emulation with out having a full install of windows. I tried it out for a minute and its pretty awesome. I know people are straying away from IE 6 but this is perfect for any mac designer who needs to check IE 6 out, you should also have IE 7 on another boot of windows, but in windows its really tough to run more than one version of IE reliably. I will definitely be using this app a lot!