Yes, there is one from DualCode http://www.dualcode.com/bigbluebutton/ and from Blindside http://www.blindsidenetworks.com/integrations/moodle/
Related forum thread: http://moodle.org/mod/forum/discuss.php?d=185675
Web conferencing plugins (including BigBlueButton)
Bigbluebutton plug-in for Moodle 2.x
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