Hrmm, a Hacker Media talk at a hacker con..
The history of hacker communication and the rise of hacker media would be a good topic, as was suggested.
As someone that is familiar enough with the history, though, I'd definitely want to see a mention of where hackers congregate to get their news and communicate these days. Going over how we got to where we are today would be interesting to listen to, but the mention of some new sites, forums, groups, etc of interest would give me something to take away from the talk as well.
Otherwise it sounds like an interesting talk by itself to hear about some of the challenges of producing for such a niche audience. :)