Cache Thumnails
I see Clipper uses mshots from Wordpress in order to generate store thumbnails. ie:
http://s.wordpress.com/mshots
There are a few problems with this as is evident with the Clipper demo:
http://demos.appthemes.com/?theme=clipper
It is free to use this service for non commercial purposes and not caching these thumbnails puts you at the mercy of Wordpress itself, this definitely needs changing.
A service like
http://www.thumbshots.com/ would provide better value (as long as the generated thumbnails are generated locally).