When you install Coda Notes, you’ll get a new button in your toolbar. Click it to see all our annotation tools, built right into Safari. Draw some notes on your favorite website. Communicate changes, ideas, concepts, or problems. Then, when you’re done, hit the Send Notes button and the whole page flips over as a postcard.
via panic.com
Can't wait to try this one out! I use the Coda app for web development and love it so my guess is this will be another delightful app.