Technical Forum on Web and XML -- Call for topics and speakers

I have volunteered to moderate a recurrent technical forum on Web and XML technologies. My current thought is to have a presentation - perhaps a white paper, perhaps a set of slides - on a given topic from one or more speakers, and then to do a bunch of Q & As as threads. A given forum would run for a week or two and the speakers would commit to participating in the discussion through that period, then we would close it and start with a new one. I would like to give it a try for a few topics, then evaluate how it goes and fine-tune the concept if it proves useful.

The topics for the forum would cover XML Applications, Web Applications and Web Services - again, we fine-tune as we go.

I already have a number of ideas and victims... err, potential volunteers. Please contribute ideas in the talkback of this blog.