Source: http://lifehacker.com/5621474/tweetright-shares-pics-text-and-links-from-the-chrome-context-menu
Chrome: If you find yourself frequently cutting and pasting links from your web browser to include in Twitter updates, TweetRight offers easy sharing of pictures, text, and links right from the Chrome's context menu.
In the screenshot above we're sharing a picture from a prior Lifehacker article—Keep Your Cats From Destroying Your Furniture—to Twitter from the context menu. TweetRight adds a "Post X to Twitter" menu in your right-click context menu where X is the type of content such as an image, a link, or a text clipping. In instances where the object is two things such an an image and a link, you can select which you'd like to share.
TweetRight requires that you have an early release version of Chrome 6 such as Chrome 6 Beta or Chrome 6 Dev Channel installed. Found a new extension that takes advantage of the recently enabled add-to-context menu abilities in Chrome? Let's hear about it in the comments.