still use linux even if you need to go to stupid sites that say "you need microsoft internet explorer 5.5 to use this website". You do not even have to run IE, or wine.
Konqueror (3.1.0) and firefox (and probably other browsers) can be configured to say that they are IE when asked by a website. Yes, they are "lying", but it makes the stupid website work, and is very satisfying!
For konqueror, the setting is under Tools-Config Konq-Browser Identification.
Firefox needs an extension to do this, find it here: