You get 5 minutes to show off what you've built (tool, hack, library, etc). We're language and technology agnostic, so it's all fair game. Then the audience gets 5 minutes to ask you questions about it.
While all technology is fair game, there are a few rules:
: Let me clarify the "no job projects" rule. We want to promote the projects that people do in their spare time, for fun, or utility, and not the kinds of projects that are only applicable to people who work in your company, or your direct clients. On the other hand, there may be a project that you've built primarily at work, that solves a *general* problem that your company has allowed you to release with a libre license--this is usually fine.