Wow Shoes, sounds like they were serious about the do not call line in the waitlist letter. Well at least they said you would know by the end of the month and not mid August.
Thanks to everyone on their letter writing advice. I've spent my weekend writing what I hope will become a persuasive letter about my undying desire to attend Southwestern. I've also included and updated version of my resume so they can see what I've been up since I sent my application in. Anyway, I'm overnighting this bad boy ASAP on Monday morning. Hopefully this will increase my chances.