This reminded me to go and check out what new talks there were since I last looked and there were plenty (far too many to list here).
If you're not already a tech-talk viewer, go and take a look. While they're obviously predominantly computing-related, there are also plenty of philosophical and social justice topics, too.
I pointed my mate Paul to a few yesterday. He's already posted about one and I'm sure there will be more to come as he works his way through them.
Here's the talk on spimes.