I'm a keyboard-always kind of guy, and I'd like to suggest a minor enhancment- put accesskey attributes on the submit buttons, so that when you create a post you can just hit "alt-s" to submit it, or "alt-p" to preview it. (it's the alt key on windows and linux in all the browsers I use, not sure what it would be on a Mac.)
This is a really nice time-saver, and admins especially (or others who post frequently) would appreciate it. This is also a boon to those few folks who may use screen readers to browse the site.
Example: <input type="submit" name="submit" accesskey="s">
-Any sufficiently advanced technology is
indistinguishable from doubletalk.