Best PNG Compression Software?

PngOptimizer 165KB in about 2 seconds.

Image quality is untouched.

I've only ever used pngcrush but it works well and has plenty of options.

Just for a quick benchmark, I downloaded 170 random PNGs from different websites on the internet, totaling about 8MB. Here are the results:

Original: 8,403,619 bytes total
PNGCrush: 7,398,194 bytes total
 Optipng: 7,340,167 bytes total
  PNGOUT: 6,938,205 bytes total

So it seems PNGOUT (or any GUI based on it) is the best choice if size is your primary goal. These are all lossless transformations.

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