Don't quite know what to make of it, but getting del.icio.us to regularly post into Movable Type, seems like a sweet hack. It's the marriage of one of lightest interfaces on the Web with one of the better Web authoring tools. MT is pretty lightweight, but del.icio.us already has about five different interfaces, three of which are tightly integrated with the browser (sidebar, right click, bookmarklet).
The combination may also help relieve load on del.icio.us since a bunch of functions folks have been asking for can be outsourced to their favorite local content management system, presuming it supports the MT API.
Going completely meta, someone could outsource the regular reading of del.icio.us RSS feeds and posting them into registered cmses.
Update: Gave Joshua his just due and put the second h in schachter.