Fairy Room has been documenting the phenomenon with lots of good photos and detailed descriptions. Check out their article and the photo album collected by David Colburn.
To honor this infestation of little friends of the forest (...well, urban jungle in this case, seeing as they are roosting in the heart of Oakland), I am posting several of my garden gnomes that I painted back in April.
Average length of feather: 1" to 2"
2/1/13 UPDATE: The Gnomes of Oakland are making national news (which you likely know if you are reading this blog post today). See my other post on the Oakland Gnomes and Google them. They have recently been covered by major news providers such as NPR, the New York Times, and MSNBC. They have won a fight with the phone company and are not being evicted from their telephone pole nests. It's a great story.