Just thinking out loud. Where's the tool that will watch what I write on my blog then analyze, summarize, and help remix it?. Inspired by thinking about a Movable Type into del.icio.us plug-in, but being convinced that's probably not the right place to put that functionality since editing becomes reliant on the uptime of another service.
The idea is that you write a post in MT, using a custom syntax mark some of the links as destined for del.icio.us, sit back and relax. Think of it as an alternative, and familiar, DIU posting interface.