I updated an older WordPress plugin of mine today. It’s called Narwhal (or technically Narwhal Microblog). You put a shortcode called narhwal on a page and a microblogging form appears. You type into the textarea in a certain way, and then the post title, content, and tags are automatically separated out.
(You type the title in parentheses)
Put the content on a new line. And, you can #hashtag.
I added a couple of settings so that you can switch post types. Plus, changing categories was broken so I fixed that.