With Press This Reloaded plugin by scribu you will have access to all the meta boxes, not just Categories and Tags.
Also, plain URLs are inserted in the post content, letting the Embeds feature do the rest.
Important: After activating the plugin, you will have to re-add the bookmarklet, from WP Admin -> Tools.
Download and info: http://wordpress.org/extend/plugins/press-this-reloaded/