Do you use ImageMagick for image generation? (I've had issues with it and am always looking for a replacement, but it just does SO much...) Do you do it yourself or via third party? What does your stack look like? Ruby on Rails and...?

I just retweeted you btw. Very impressive, actually even a little intimidating. I don't know if you're looking to be bought, but if you haven't had offers already, I'm sure they're coming your way soon