Would love to use this plugin but it doesn't seem to be working. I haven't tried doing anything to make it work for single images but it looked as though it should work more or less automatically for albums and it doesn't show up. The only thing I can think is that it's the result of using a couple other nextgen plugins for the galleries which may conflict or something.
Here's an example of a gallery that should be displaying the voting feature:
Does it depend on a certain version of PHP?
Other suggestions? Thanks!