My issue is that my wife and I like to use the same computer, use our own email accounts, bookmarks and other settings and not be stuck switching users in Vista all the time. If we both used IE7 then we'd have to log off and on to our web-mail accounts all the time....what a pain! The answer was very simple, but I've never heard anyone ever talk about this. We use 2 different web browsers.
On our computer we leave 2 web browsers open all the time. I use Firefox and Lara uses IE7. I don't really have a preference since both browsers to everything we ask. The beauty is that we can both be logged into gmail on the same computer at the same time. When I was up to our computer it's already logged on an ready to go, no fuss no muss.