I have been working on a few Meteor presentations as a part of the Meteor community in Charlotte. I wanted my presentations to have a Meteor feel, so I used the look and feel of meteor.com to setup a theme for Keynote. Thanks to meteor.com's very cool background, curved cornered white rectangles, and liberal use of Helvetica Neue, I think it works out quite well. Usage: Download the theme. Make sure to unzip the file. You can then open the theme and Keynote will allow you to use the it.
Special thanks to the Meteor folks for allowing me to share this!