If you want a sneak preview on the proposed changes to content creation, and perhaps get involved in the discussion, see http://drupal.org/node/1510532. There is even a demo site to try some of this out.
196511 sites use the very well established Webforms module - so it has been a very popular module for some time. However, in some ways, it is getting a bit long in the tooth now, especially with some of the new features available in Drupal 7, such as Rules integration. So along comes a new upstart, Entityforms. This brings the webform functionality into standard use of the Drupal 7 field API, and is based on the well-
Day 3 began with a very dynamic speech by Luke Wroblewski. He made the point very clearly, just how important development for mobiles is. Although I didn't attend the (not directly related) session that followed on mobile theming ("Creating Responsive and Mobile-First Drupal Themes"), it is probably is worth checking out:
Here's a useful one you may not know about: field_get_items(). Basically, if you're trying to get field values off an entity, it can be fiddly - dealing with language, indices, etc. This function makes it much simpler. Just give it the Entity Type (e.g. 'node'), the entity itself and the field name (e.g. 'body'), and it will return the value that you are looking for.