The HUMBUG mailing lists have recently been a-buzz with talk of Suncorp-Metway's apparent pro-IE+Windows and anti-Mozilla+Unix stance in its online terms and conditions. These conditions were later clarified in a form that I hope will stand up in court but have personal doubts about with in this follow-up.
Greg Black linked to this article which contained a comment by Bill Godfrey:
I keep IE hanging around, but I have the proxy server set to 0.0.0.0 and I make exceptions in the no-proxy-for list.
I've now adopted this policy on my work machine, although I've set my proxy to localhost (127.0.0.1) instead of 0.0.0.0 as I consider this a touch safer. Since IE and Mozilla have distinct proxy settings this prevents IE and its variants from accessing remote sites while allowing me to roam freely under Firefox. This is particularly important for me because Lotus Notes explicitly embeds IE for its internal web browsing and has a habit of doing things like looking up IMG tags from spam. Hopefully this will put a stop to that.