Located in the first pond out on the marsh trail today at 3:45pm. After consulting my Audubon book, I've come up with this ID. Is it correct? It never came out of the water, and spent a great amount of time spinning around and sticking its head in the water.

Photos:

http://www.wildmaven.org/birdwatch/phalarope1.jpg
http://www.wildmaven.org/birdwatch/phalarope2.jpg
http://www.wildmaven.org/birdwatch/phalarope3.jpg (shows the back)
http://www.wildmaven.org/birdwatch/phalarope4.jpg