While browsing the ever growing web today, I came across this: http://windowslivewriter.spaces.live.com/PersonalSpace.aspx?_c02_owner=1.
This appeals to me; not only have I been toying with the idea of writing something along the same lines (there are actually many tools out there that profess to do this, but many are exceptionally poor), but this is free too.
A short download and install later and it's up and running. I'm actually using it to post this...
So far, very impressed. Anyone who has a blog, I'd suggest you check this out.