Michael
I Love YTtalk
I always use smushit or the program PNG Optimizer myself, you wont get much compression using them but you wont see any quality loss. Most of the YTtalk images are compressed with those.
Holy crap it's you! Any ways I only compress my thumbnailsThis is actually quite awesome, I haven't had a chance to check it out yet but if it really does cut .png's down by 75%? hats off to you sir.. thanks for sharing
EDIT: I had a look and the website only converts png-24 to png-8 ... Most programs can do this, including photoshop.
This could be useful for many though..