Loads of links on CSS transparent divs (using .pngs)

I haven't enough time to format these and add commentary, but they've all got good info

http://thedesignspace.net/MT2archives/000103.php

http://pure-essence.net/archives/2004/06/01/transparent-png-background/

http://regretless.com/dodo/newworld/index.php?page=tutorials/graphics/transpng.php
People who using animated title bar scripts should be beaten. Nevertheless, this is a pretty neat trick, from what I can tell.

http://www.daltonlp.com/daltonlp.cgi?item_type=1&item_id=217

http://www.alistapart.com/discuss/pngopacity/14/