Thanks to Jim Miller for reminding me about this contest, sponsored by the Cornell University Lab of Ornithology Celebrate Urban Birds Project.
Basically, the Lab is looking for pictures showing odd places birds choose to nest. For rules, prizes and some of the entries so far, see http://www.birds.cornell.edu/celebration/challenge/funky-nests-in-funky-places. I especially like the hummingbird nests (entries #28, #29 and #35).
If you have any photos, be sure to submit them before July 31!