Some type of water snake (not likely a cottonmouth, who's head is more distinct from its body than this one's was.)
Adult bald eagle & nest.
Juvenile bald eagle. (Update, Aug. 25, 2009; Published on the front page of the St. Tammany News Aug. 21, 2009.)
Great horned owl.
2 nutrias (who were doing a strange display, possibly related to mating.)
Louisiana iris & a spotted cucumber beetle.
A juvenile gull of some sort.