Postie - Kafka Consumer Framework

Hi all!

This excellent presentation on StumbleUpon's implementation of Kafka and other Open Source technologies mentions 'Postie' as a 'Kafka Consumer Framework':
http://strataconf.com/strata2013/public/schedule/detail/27419

Can anyone share some more details on this?  Relentless Googling has been little help in tracking it down...

Thanks in advance.