The Firefox plugin at addons.mozilla.org is messed up (I looked at the contents and found it's an html document). However, the "Benefit right away by installing the firefox plugin" link has a working xpi. Just a heads-up for anyone wondering why they can't install the plugin. :-)
EDIT: Oh, and the statusbar icon is utterly pointless.
I like the minimalist look. However, the bookmarklet shouldn't be confined to the "Post" section. Make it clear that to post images, one needs to use the bookmarklet.
It would be nice if the images either had no title at all, or the user that posted the picture could change the title.