• Automatic Macro Insertion
  - Ad Manager will automatically detect the ad tags from several popular
  3rd party vendors when you paste them in as new creatives. When
  properly detected, the click-tracking and cache-busting macros will be
  inserted automatically.
• Competing Line Item Report
  - The quantity booked, amount delivered, and the current delivery
  status have all been added as new columns to the competing line items
  report.
• Overbook Details - When
  warned about possible overbooking, you now have the option to book only
  the inventory that is available. A new link to a “Detailed Inventory
  Check” will also provide quick access to more information.
• Export Ad Slots - The new
  “Download Ad Slots” link on the Ad Slots tab will export your entire
  slot list to a CSV file. This is useful to audit your inventory and
  verify AdSense settings.
• Edit Company Name - The company display name is now editable on the Admin > Settings tab. This name is seen by advertisers who you invite to log in and see their orders.

By the way - I love Google Ad Manager…