TweetThisText is a simple and fast tool that sits as a bookmarklet in your browser. You simply highlight the text on the webpage you wanted to capture and click the button. It then quotes the text and prepares to tweet it.
You could also go to their webpage and paste in text but that defeats the purpose of being single click or retyping. Half the time you want a certain part of a page, not the whole thing through a link. So this gives that quick tool. I don’t use it enough to have it in my browser personally, but many of you type text all the time.