Here's a great idea, and it's free: blogmailr. You get yourself signed up, want to add to your blog, send an email to an @blogmailr.com address... how cool is that?
Thought I'd mention that they don't work with .text yet (e.g. geekswithblogs), but they said it would probably be just a couple days. I'll mention it here when I hear back from them.
Meanwhile, you can get an acct and setup email addresses you will write from :)