I like the look of this plugin and I really like that you seem to be updating it regularly. But there are a couple of extra features I'd be really interested in and I wondered if any of them were planned for a future version.
In an ideal world I'd love to have multi-ratings with a final average rating for each post. So if you were rating an event you might ask users to rate on: organization, food, venue etc with a final overall average rating for the post.
Additionally, it would be really great to have a "Top Ten" widget.
I've got a different review plugin on my site now and am considering switching.