Some small changes in version 0.6.7:
If you had a lot of songs in your database, the songs with the most plays were always suggested at the top. This was a problem if you wanted to play some new music or songs with a lower playcount. Thus, there is now a more sophisticated search algorithm that suggests songs by relevance.
The voting restrictions were changed as well. Instead of allowing one vote every 5 seconds users can now vote 10 times every 30 seconds. This allows for some more interactivity while still preventing abuse.