Good plugin

Very easy to use, it does what described.

I’ve found a little bug into wpv-voting-func.php because with MySQL 5.5 into the bigint column can’t be insert an empty ” value: so changed only wpv_voting (post_id, author_id, vote_count) VALUES (%d, %d, 0) going to insert a zero number.

If I could suggest an improvement : implement also the feature to ‘unvote’ just adding a button that add a -1 value to the count and adding two column to count the ok votes and the ko votes.