(well, ok, I had a little help… thanks termie!)
I’m proud to introduce the stupidly simple
PNGCrushrrr, brute force compression for your PNG files. It literally is pretty dumb, just install the app to your Applications directory (OSX only!), drag it to your dock and drop your PNGs on it. That’s it!
Anyway, try it out and let me know how it works for you!
Oh, and I am aware that there’s some stiff competition out there, but I actually had made this script quite awhile ago, intending it to be used in Quicksilver. I’m just releasing it now because I find it so darn useful!