Hey DStory,
That seems smart; of course chilling is easier said than done, but the admissions board will get to you when they get to you, and you already seem to have some great offers lined up.
I was indeed a prospective for Vandy. Let's see... regarding ChemE I got rejected from Princeton and UPenn. Vanderbilt's my only acceptance so far, although I just got an interview at UMass's PSE program yesterday. Other schools I've applied to are... JHU, WashU, Yale and Columbia. And then the rest are Mat Sci programs I think.
As Dugmel said, Yale generally contacts the students they're interested in by the end of January, so I think we're both out for that one.
Speaking of which, anyone know anything about Columbia's ChemE time table?