At PDC 05 myself and two other architects from Avalon (Greg Schechter and Jeff Bogdan) are presenting "Under the Hood". Our goal with this talk is to give a overview of how we built Avalon. What the major sub systems are, how they act and interact. My plan right now is to go through the life of an application, from XAML and compilation to displaying pixels on the screen, then following how input gets from the keyboard/mouse to your element in memory. That's the first 30 minutes.

Then we want to do Q&A for 45 minutes. Any question about how Avalon is built, what things do, why we did it that way, what options did we not do, anything!

There is always a fear when you do these Q&A focused sessions that no one asks a question. So, I'd like to poll everyone to get some "feeder" questions. If you are going to the session - what are your questions? If you aren't going to the session - what are your questions? I'll try to answer as many as possible, and write the answers down and post them somewhere on the web (here, MSDN, something).

Thoughts? What do you want to know about the inner workings of Avalon?