As an extra to my latest post, and the one I wrote earlier about how to use Description Metatags you can view this video of Matt Cutts explaining how the results below your Title tag is build.

One of the nice things here is that he also tells you to experiment with these tags, like using just .. or … at the end of the description…

Guess there is some rewriting to do on your descriptions tags… you did use them right?

Anyway, here is Matt's explanation: