Display Suite in Drupal 7
Display Suite for Drupal 7 included a lot of updates. The big ones are the inclusion of the previously-separate Node Displays and Views Displays modules, and support for more region layouts (the D6 version had a single pre-defined layout).
The feature that's making my life easy today, though, is a little thing: positioning the node post date separately from the node author. This was an option in D6 too, and I knew the module could still do it, but could not for the life of me figure out how. On the Manage Dislpay tab for my content type, my only options were the node body and taxonomy fields.
So, for your reference and mine: Display Suite fields only become available once you choose a layout under "Layout for [node type] in default" on the Manage Display tab.
I have a feeling I'll forget this step in the future, but hopefully I'll remember to look here for the solution!