Mr. (or Mrs.) skinny legs hangs out on the nest.
Not sure how many more times we'll make it out there before the trees leaf out, but if we go again and see some activity, I'll let you know!
PHOEBE NEST UPDATE: Things at the nest have been pretty quiet lately. She seems to stop in only a few times a day, and very briefly at that. It would seem that nest construction is complete, but again, we still have no idea if she's started laying or not.