For those of you who simply wish to buy a commercial application or download a zipfile full of executables and start looking at or making pictures, the pages below have pointers to a large number of applications that are known to support PNG in one form or other, or that are going to support PNG in the near future. Also take a look at the W3C 's page of PNG testimonials for the official word from companies like Microsoft, Hewlett-Packard and Agfa. The same is true for some image viewers.
Life is full of uncertainty.