MarkUp. Share. Repeat.
MarkUp lets you draw on any webpage to quickly share your thoughts with coworkers or friends. Launch MarkUp to activate the toolbar. Start drawing. Publish to create a link you can send to others.
With this extension, you can launch MarkUp without using a bookmarklet. Just click on the extension icon or use the configurable keyboard shortcut (default: Alt+Shift+m) to start drawing.