I like this widget But I thought that I should give a heads up to other people looking for a rating widget.
1. the rating widget is hosted elsewhere. On the creators servers so you won't have access to the ratings.
2. It cannot show ratings for posts under one category. It only shows all ratings across all posts in the widget or all ratings in comments using the thumb rating system.
If these facts do not bother you then this widget is perfect for you. It is definitely the best ratings widget currently available for wordpress and it even incorporates with other major plugins like buddypress and bbpress which is a major plus as well.