When I access the site:

http://www.sitepoint.com/examples/3col/

using firefox (1.5.0.10) on WinXP and shrink the width so the center exceeds the columns - the footer does not adjust down like it does in IE (isn't that a switch).

Getting 3cols to work with CSS is tough - the amount of hacks, negative margins and java is almost sending me back to a table for a layout.