till wrote:
With Internet Explorer behaving so weird when it comes to PNGs I see no reason to use them (at all). After all IE is still the most used browser.
Well, it depends. It's not as easy as "GIF is bad, PNG is good".
GIF: -) 256 colors only -) small in size -) transparency works
PNG: -) true color -) larger compared to GIF -) great transparency support, but broken in IE
Both have lossless compression (not like JPEG).
So it depends on what you want to do with your graphic and if you need true color or not. If you don't use transparency it's fine to use PNG within IE, if you don't need true color use GIF because the files are smaller.
Best regards, Mike