Over the past few years as I gain more and more experience in not only building software and products but also in leading teams and projects…
From my experience, PunyPNG produces better results than Smush.it does.
The sprite image for this blog yields 160kb when it was created. Smush.it reduced the size by 30%, PunyPNG reduced the size by 50%.
The PunyPNG API is going to be extremely useful when it is out of beta.