First of all, +1 on everything Chrys said.
Having been to probably too many conferences about the Future of Journalism, I agree there is a serious lack of meetings where people come away with new knowledge of how to actually DO STUFF. So this would be exciting. Some ideas for content:
a) "Crash courses" where one or two well-spoken experts teach people specific new skills. Potential topics abound on Hacks/Hackers: How to run apps in the cloud, process pdfs, manage mass email, do version control, create visualizations, HTML5, even playing with spreadsheets and how to get started programming. As Chrys mentioned, don't forget the newbies. We're all beginners at something. Give these courses enough time that they can dive into code and have people get their feet wet making something. Ie: a lot more than 50 minutes.
b) "Show and tell." Some of the best sessions are people who built cool apps showing them off, telling how they built them, sharing lessons learned. Lots of folks would to peek behind the scenes of Patchwork Nation, or this month's amazing NYT graphic, or the Times of London's crowdsourcing, or that epic WSJ video on the financial collapse. And we'd like to ask the creators questions.
c) Not all panels are bad. With the right people and the right topic, they can be enlightening. Sometimes panel discussions are the best medium. Some show and tells could be better as panels -- not just how one paper's team builds maps, how several do. Other ideas for panels: How hacks work on investigative teams, how to get a newsroom to buy in, designing for tablets & mobile, trends in UI, making the most of comments, maybe a long audience Q & A with smart people. As long as they keep to specific, practical ideas.
We don't need any more philosophical debates about narratives, niches, imaginary business models or -- God forbid -- social media. There's plenty of all that already. Basically if you ever think "Jeff Jarvis would be really good on this panel," kill the panel.