Originally posted by blufive
When making this choice, you should be aware that IE/Windows has serious problems with its PNG support
Take note though, that the problems IE/Win has with PNG images is almost exclusivly with advanced features not available in other formats at all.
Thus it's only not allowing you to take advantahe of PNG to it's full potential, not making the format a worse choise then eg GIF.
(which is criminal given how many other Microsoft apps can handle them just fine)
Even more so when you consider that IE/Mac was one (if not THE) first browsers with really good PNG support.
Since then years have gone by and several versions later IE/Win still has eg crappy support of PNG alpha transparency.