If you use Firefox as your internet browser and you blog, you owe it to yourself to check out Performancing for Firefox, a plugin that allows you to create a blog post within a split screen right in your Firefox window. This makes it easy to add the links, images and content from one screen, as opposed to clicking around in tabs to get the links, etc. you need.
The extension supports multiple blogs, and it works with most of the major blogging platforms. As Duncan Riley points out, all it needs to be nearly perfect is the ability to easily include Technorati tags.