I’ve been looking for this and it’s right under my nose. I’ve been using the Windows Live Writer add-on for Firefox but since it doesn’t work with FF3 I’ve been sort of at a loss for a quick and easy way to directly post from the site I want to reference. Alas, from this article below, “Press This” does the trick. And it’s been hidden in plain site all along!

20 Useful Bookmarklets – Stepcase Lifehack.