I released a new version of coWPAtty that includes support for OSX, FreeBSD and Linux systems.  Also introduced is the ability to perform WPA/WPA2-PSK cracking on networks using IEEE 802.11e QoS data frames.  You can grab coWPAtty, check the README and get more information from the coWPAtty page on this site.

Please hit me up with questions or comments, thanks.

-Josh