Abiword RDF Drag and Drop from Ben Martin on Vimeo.
I think these sort of user interface additions help to make using RDF quick and easy, even for those who don't know or care what it is and where it gets stored in the document. Abiword can load and save RDF in both it's native abw files and ODF formats. You can of course convert between both without loosing the RDF ;)
I plan to add D&D in the other direction later on, so you can pickup a person from a document or an event. Similar to how many email clients let you import ics calendar files into your local Calendar. Having RDF in ODF lets you share content, style, and semantics, all in a truly open format single file.
Oh, and the code should hit svn trunk real soon now.