Wow, there has been some amazing usability improvements going on in Drupal 6 lately. Drag and Drop has been approved for the Blocks page, and Nate has two more issues in progress to get drag and drop into Menus and Book

I have been so inspired by this work that I have turned the work I have been doing with modal dialogs/popups into an patch and issue. Check out Adding Modal Dialogs to Blocks Admin. It has basic dialog infrastructure and two very cool examples of how they could be used.

This is the first time I have put together a proposed feature to core from scratch, so I probably did something drastically wrong, but hopefully I can get some involvement from more experienced folk.