Drupal offers a lot out of the box, but most likely you'll be drawing on the enormous contributed module repository for more. If you haven't been using Drupal for long, you might not be aware of the goodies that long-time users know. This session will offer an overview of the some of the best contributed modules for Drupal 7, helping you get off to a good start. I put "top" in quotes because that's subjective, although I think what I show will be considered the good stuff.
I gave a presentation like this last year as well, so depending on the audience, I might either skip the modules I talked about last year, or cover the same stuff, but leave off everything that was only for Drupal 6.
If you have suggestions or ideas, leave a comment!