How can I let users rate content with half stars in Fivestar?
I've written a module that alters the fivestar module to allow halfstar voting:

Halfstar

After installing the module an option is added to the field instance setting form allowing half star voting:



Which then allows voting with half stars:



There is a rounding bug that occurs occasionally at the moment when using the Stars (rated while editing) widget. If you have 9 stars and then vote 5.5 is display as 5.6.