It was very challenging to work on 3.0 feature set and my team worked really hard to ensure release was as per schedule. Now that CiviCRM v3.0 alpha1 is out, I can shed some light on my favorite features in 3.0
Usability
* Navigation Menu, I bet this will help to reduce number of clicks needed to navigate inside CiviCRM.
* “Create New” (Shortcuts select) and “Recently Viewed” blocks ( shows recently modified / viewed objects)