Alpha channel PNGs in IE

Gifs suck. PNGs (Portable Network Graphics) are much better – more colours, freedom from intellectual property rights, and (best of all) an alpha channel for transparency. Some good articles:

PNG opacity (with some nice examples)

Fuzzy Drop shadows (like on Google Maps)

Transparency with HTC files

And again

– Choosing what image to serve in PHP on the server

Related: Opacity in CSS, being able to see through DIVS – CSS Transparency for IE, CSS Opacity