I am on the same boat as you are. However, you can expect people to upgrade from IE6 to IE7, but not IE to FF or Chrome. Think outside of the geekdom - people are used to and happy with IE and do not want to venture out into anything developed by hackers (for them hacker is still a bad word!). I am planning to make my app IE7 & IE8 friendly (IE6, forget it! I will live with those users giving up on me).