GrabUp is an interesting little app that adds a new wrinkle to OS X's built in screen capturing functionality. When you install the prefpane, it allows you to add the GrabUp menu item to your menu bar. GrabUp just sits waiting for you to invoke it (by hitting Shift - Command - 4). Once you hit the key combo a crosshair pops up, letting you select part of your screen to capture. So far this is pretty standard stuff. The image is saved to your desktop and uploaded to GrabUp's server (like this) and the URL is automatically copied to your clipboard. The idea is that this will make it very easy to share screen captures over IM or email since no account is needed. The app just uploads the image and returns a unique URL.
It isn't as robust as Skitch or ImageWell, but its beauty is in its simplicity. You don't need to have an FTP login or Flickr account to upload your picture to the web, and that is pretty compelling. The only question I have is: does it scale? What happens when thousands of people are using this app?
Thanks to everyone who sent this in.