The talk I gave on Behemoth at BerlinBuzzwords has been filmed (I do not dare watching it) and is available on http://blip.tv/file/3809855.
The slides can be found on http://berlinbuzzwords.wikidot.com/local--files/links-to-slides/nioche_bbuzz2010.odp
The talk contains a quick demo of GATE and mentions Tika, UIMA and of course Hadoop.