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Re:The Tiniest GIF Ever by Inversechi on Sunday September 09, 2012 @04:58PM (#4496966)
Just to add... for PNG optimisations on Windows.

* PNGGauntlet - http://pnggauntlet.com/ - Combines PNGOUT, OptiPNG, and DeflOpt.

Re:The Tiniest GIF Ever by j_s on Monday September 10, 2012 @02:35PM (#4501324)
If you're desperate to save space (or creating thumbnails), Windows/C# devs can lossily cut down PNGs to 256 color/8-bit using nQuant http://nquant.codeplex.com/

Matt Wrock documented the creation of the tool, including details on the approaches taken by tools like OptiPNG: http://www.mattwrock.com/post/2011/09/05/Convert-32-bit-PNGs...