Now's a great time to mention that I really don't like the word pushback. The definition of the word pushback doesn't match the way people (mostly Dave Winer, but I've seen it spread a little) have been using it lately, and secondly, I think the word is confrontational, whereas the word I prefer to see, feedback, is much more respectful, constructive and friendly.

Pushing is rude, Feeding is mmm, mmm good. ;-)