I don't know about technical reasons, but here are some other reasons
why png files are better than gifs:  http://zgp.org/~dmarti/burnallgifs/

Here's a list of browsers that support PNG:
http://www.libpng.org/pub/png/pngapbr.html

Phil Mendelsohn wrote:
> 
> Can anyone give me a read on how portable PNG files really are?
> I figure everyone can read them, but before putting a bunch in a web
> site, I thought I'd get some feedback.  I also read some opinions on
> the GIMP site that made it sound like they were superior for some
> reason to .gif or .jpg files.  Any opinions here on how?
> 
> Thx, Phil
> 
> --
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> sitting down to eat a moose." --Douglas Wood
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-- 

Jesse Erdmann 
Engineer 
Secure Computing Corp.