PNGs, transparency, browsers and frogs

Just two links for info on PNGs, transparency and browsers
http://rickosborne.org/blog/index.php/2007/10/22/use-fireworks-for-pngs-ever-look-inside-them-you-need-to/
http://www.sitepoint.com/blogs/2007/09/18/png8-the-clear-winner/
AlphaImageLoader for Alpha transparency
http://homepage.ntlworld.com/bobosola/pnginfo.htm
http://webfx.eae.net/dhtml/pngbehavior/pngbehavior.html
CSS method http://www.themaninblue.com/writing/perspective/2004/06/18/