Aww nuts. Received this message when I logged into Flickr yesterday:
Dear Old Skool Account-Holding Flickr Member,
On March 15th we’ll be discontinuing the old email-based Flickr sign in system. From that point on, everyone will have to use a Yahoo! ID to sign in to Flickr.
We’re making this change now to simplify the sign in [...]

Using a carefully adjusted photo, one can create the illusion that your computer has a transparent desktop. A neat effect, and some of the photos in the gallery are quite amazing.
via Boing Boing