I see that voting for sessions is coming up fast (on 16th Feb). I actually submitted my two solo talks early, at the request of the organizers.

• Node Access in Drupal 7 is a developer talk that will look at the features and changes in the Node Access system for Drupal 7.
• Sharing content across multiple sites with Domain Access is a more general site builder talk that I'll be doing with Katrin Silvius of The Beehive.

And, for the truly geeky, many of the features in Domain Access inspired Node Access changes in Drupal 7.

So remember to vote early and vote often.