Speed up your website!

For those of you who create websites, here is an interesting article about speeding up websites (and a free little tool, too!):

ySlow a firebug/firefox plug-in: 
http://developer.yahoo.com/yslow/
Most of the rules revolve around making sure the browser doesn't have
to work too hard to load and display your Web pages, particularly by
making maximum use of the browser cache. That's where your browser
stores bits and pieces of the Web pages someone downloads.
http://www.baselinemag.com/article2/0,1540,2197256,00.asp