Playdar is under active development, you are encouraged to compile it yourself from the source code if you are that way inclined.
These installers will give you a recent (17/Nov/2009) install of Playdar. They come with a stripped version of the Erlang runtime so you shouldn't need to install anything else to make them work. That said, these packages are rather new, so please be prepared to hop on IRC or the mailing list and ask for help if something doesn't work as expected :)
Playdar.prefPane-0.1.13.tar.bz2
Mac prefpane & package author: Max Howell
Playdar Windows Package
Windows gui & package author: Steven Robertson
Visit the irc channel (Freenode, #playdar) or mailinglist and say hi. We are mostly in London/Europe timezone, and would be glad to help you get started.