I never browsed full-screen because it's too "wide" but with Windows 7's new "snap" feature (http://windows.microsoft.com/en-US/windows7/products/feature...), I can now have 2 browsers comfortably side by side. Helpful tip - it won't "snap" to the inside edge of a multi-monitor setup using the mouse, but Win+<arrow key> works (that's the keyboard shortcut for "snap").

I realize that this feature has been in tiling window managers for quite some time, it's just nice to have it in Windows now.