I've just found a good-looking word processor on the Web - it's called Zoho. I'm using it to write this post, and I'm about to try the "Publish" function for Blogger, LiveJournal and TypePad. Thanks to Ismael Ghalimi at IT|Redux for the pointer ...
I might just add a title now and see what happens - I'll be interested to see if it updates the existing post, or creates a new one. Will have to edit in TypePad to get the trackback happening, so I'm not sure it's going to take over for blog posts, but maybe other stuff.
[Note - it created another post, so I had to delete the first ...]
[Update] Editing in TypePad now so I can ping the IT|Redux post