I guess the answer to why we're still using both GIF and JPG formats for the majority of web-based graphics is the ample support they have from the vast majority of browsers.
As far as I'm aware PNG transparency doesn't quite work with all modern browsers. To add insult to injury, the SVG plugin works fine in IE, but not in FireFox. Aaagghh!! anybody got another way of viewing the web other than with a browser? :o)
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