Snap Preview Anywhere is a cool function. It is now installed as default on all blogs at WordPress.com. Snap Preview lets the reader see a small image of the linked site which makes it a lot easier to decide whether to go there or not. Snap also has a blog.

Snap preview is easy to install. Just register your domain at Snap, get the code and paste it into the header of your webpage or blog.

Update.
I have turned off Snap Preview as part of my de-clutter project.