If you do web development you may want to test your web applications under IE.
In case you work under Linux you have a few options for this:
a) have another machine with Windows installed
b) have Windows installed on the same machine and reboot each time you need to perform some testing (don’t forget a need to run web server under Windows too or upload your changes to a live server)
c) have Windows installed on the same machine and try to launch IE using wine
d) use IEs4Linux
As for me – option a) isn’t convenient (and requires additional computer involved), b) is very time-consuming, c) is too hard task and also requires a time to get all working (if it will work at all). I found that option d) fits my needs of quick testing in the best way: IEs4Linux – is a tool which installs a lightweight IE package on your Linux system (as I understand this is a variation of the option C) – they even offer a few versions of IE. The package is installed quite fast and easy even for me – not an admin person.
Well, it may glitch sometimes (as IE does in general), but what you get is pretty enough to check some JS/HTML.