One thing I'm having trouble with...on the google validator tool, I'm getting this error:
"Error: This information will not appear as a rich snippet in search results, because it is contained in a hidden HTML element. Except in special circumstances, Google won't display content that is not visible to the user. You should mark up the text that actually appears to your users when they visit your web pages."
It' s been an issue for other plugins as well: http://wordpress.org/support/topic/plugin-gd-star-rating-question-regarding-the-implementation-of-microformats?replies=15