In person
2011
2010
2008
DebConf8: derivers roundtable: video (high and low quality), Jonathan McDowell's blog post
2007
DebConf7: derivatives roundtable: video (high and low quality)
2005
DebConf5: derivatives panel: video (high and low quality), LWN article
IRC
2011
Inaugural derivatives irc meeting ?Derivatives/Meetings/2011-10-xx