I still really love the Manila/Radio Userland/Frontier platform for blogging and writing and still use the OPML editor (now under GPL) on the mac. There was an publish via email feature way back in 2001-02 as well as the whole EditThisPage idea. Of course Posterous is really cool too and has a ton more dev going into it now but I really like the idea of the OPML outliner and outliner software in general for writing and blogging however the masses don't seem to agree with me.
I'm not a fan of outliner software personally, but I do keep yelling at them* to support Markdown or Textile so I can compose and send my e-mails straight from vim. One of the beautiful things about Posterous is that it is basically just... email! So if a standard syntax like textile or markdown were supported, you could write it in whatever you want. In your case, you could write it in OPML, write a script to convert it to textile/markdown, then pipe it to sendmail. Done!
* "them" being Garry, because everything is really his fault. Sachin is a good guy.
That wasn't a publicity stunt. I just discovered I didn't like blogging. I'd rather write things that take more time.
This new blog is different. This is for YC. For YC we often have little things we want to say.
Incidentally, I doubt Sergey Brin's blog was a publicity stunt either. He probably just had second thoughts after his first post attracted so much attention.