One of my goals this year was to do a talk at a developer conference. I did a few talks at .NET Oxford last year, and wanted to take my public speaking a little bit further, and the fantastic Developer Developer Developer conferences gave the perfect opportunity! For those that haven't heard of these conferences - there are a number of them throughout the year at different locations. They're always free to attend, and always on a Saturday. This means that most of the attendees are there because they want to be there, not just because they've being sent and paid for by their work. I've been to a few now, and there's always a really great community vibe.
UPDATE: Since doing this lightning talk, I have also done an extended hour-long version at a couple of the DDD conferences. The full blog post about the hour-long version of the talk can be found here. That includes everything that is in this post, plus a lot more. So probably worth reading that one instead of this!