This Chrome extension can now be used for more than capturing screenshots of Web pages.
Flickr co-founder Caterina Fake has released a new augmented-reality location-discovery app that works like a crowd-sourced version of Google's Field Trip (now available in Australia).
This universal iOS app lets you draw arrows and rectangles to mark up screenshots on your iPhone or iPad.
Create, annotate, and send screenshots without having to clutter up your desktop.
The Annotate Attachments in Gmail extension lets you annotate attachments right in Gmail and creates cloud-based files for easier collaboration.
By using a digital textbook you're able to save a few trees, take notes inside, and lighten your backpack.
Come out swinging with this week's prize, a portable sensor and app from NewSpin Golf that help you analyze and improve your game.
The startup, RapGenius, has developed a way to annotate with additional information everything from rap lyrics to poetry to news.
The Skitch app offers a simple layout to add comments to photos, maps, or just simple drawings.
New support for Retina graphics helps a lot, but Stephen Wolfram's magnum opus about math, computing, and physics could be so much more.