Is there scope for a preview feature when submitting posts? ie, so you can see what it looks like before actually submitting? Okay, posts can be edited if, for example, there's an error using the markup BBcodes, but preview means you can get it right the first time.
Also, just a very minor point - when editing a post, the button at the end of the edit box should say 're-post' rather than 'edit post'.