I use multiple FF windows ocasionally - how about if you need to look at an email and a web page at the same time?
Can't do that with tabs.
I definitely take full advantage of tabs, I'm always begging and pleading with people that don't use tabs to start. The reason I have multiple Firefox windows open is because one window is always a media player window, for listening to online music (opens in a new window and is not full screen, could be tabbed but like having it available when I want to skip to next soung). The other two windows each had 7+ tabs open in each of them. One is usually a work window or in progress window and the other is general browsing and other stuff to do. I usually work with two windows because I don't like having 20+ tabs open, although often still happens even with multiple windows.
Thanks for the information Kip, was just curious.
Nice to see some non Microsoft Windows desktops Johnk, your Ubuntu desktop looks good.
Nice to see a Vista desktop too Zylstra, looks good. I like that wallpaper.