Nathan Torkington of He Hononga Software, Limited presents "fork() && exec(): Spawning the Next Generation of Hackers". It's not about sex; rather it is a good look at how to encourage children to hack. The presentation includes some neat software that will actually inspire kids to hack, as well as what to avoid.
Exceptional Software Explained: Embrace Error, by Robert "r0ml" Lefkowitz of Asurion. One of the contenders for "best open source comedian", r0ml delivers a humorous look at the past and future of software development models. This keynote was delivered at OSCon 2008 on Tuesday evening.
Brian Aker gives the "zinger" lightning talk about the newly announced "Drizzle". This short (under 8 minutes) video captures Aker's highlights of why he started the Drizzle project and how Drizzle is different from MySQL -- both in what has been removed from MySQL and what features Drizzle can accomodate.
The last keynote of Tuesday evening at OSCon 2008 was entitled "Temporally Quaquaversal Virtual Nanomachine Programming In Multiple Topologically Connected Quantum-Relativistic Parallel Timespaces...Made Easy!"
Damian Conway is a speaker that should not be missed. He spends his time hacking perl to do fascinating and obscure feats of technology such as time travel. This video is just over an hour of rolling laughter that will entertain you into realizing what a genius Damian Conway is.
Now, most of my exposure is within the MySQL Community, so if folks could pass the links to the video along to other communities, that would be great.