I've set up an email to blog interface as part of my ongoing investigation into making the day-to-day use of computers easier for normal people. That having been said, no-one other than me (than I?) can use it.
The guts of the new system is XML-RPC, something I'd never bothered learning until now; I can now see why it's useful.
The interesting part of this is: it it easier use your email editor, which has evolved in response to the ergonomic needs of thousands or millions of users, to edit the text for a webpage, than it is to use the mini editor inside your web-browser. So too the Content Management Systems of blog software ... these tend to be better than the CMSes for general websites, to the point where people are trying to adapt them for general use.