Chrome: Awesome Screenshot is a screen capture and annotation tool with text editing, drawing and free image sharing — all accessible from the Google Chrome toolbar.
Capture the entire page or a selection of it; after Awesome Screenshot snaps a screenshot it loads in a new tab with an editing toolbar. There you can draw, add text, and crop the image before saving it to your computer or uploading it. Screenshots are shared through AwesomeScreenshot.com, you can click the quick-send links to share your image on Twitter, Facebook, Gmail and other social networking and email services, or simply cut and paste the link to share.
Awesome Screenshot is a free extension, works wherever Chrome does and requires no registration.