what does "auto-fit pages" do in the browser In the stock Android browser, what exactly does "auto-fit pages" do? 

From my experimenting with it, the answer appears to be "Diddly-squat". 

Perhaps a better question would be "What is is supposed to do?"
Auto-fit is supposed to force the text to wrap based on the size of your screen when you zoom in on a web page.  I think.

As long as I'm connecting the right term with the right action, it has limits.  For instance, the page width doesn't actually change, and images and side bars won't change position, shape, or size.  Basically it's designed to keep you from scrolling sideways to read the text of an article.