I'm deferring. I'm a huge fan of deferral: I deferred undergrad too, and it was one of the best decisions of my life.
Anyway, I was pretty nervous that my deferral wouldn't be granted, since basically I don't have a solid reason. I want the deferral b/c I'm getting married in August. My finace starts his Ph.D. at Stanford in September. I'm headed to UC Davis, which is about 100 miles from Palo Alto, and I just wasn't excited about moving out on my new husband a month after out wedding. Not the most PC of reasons, I know, but it's mine. I pretty much explained all of this, and mentioned a job I've applied for but haven't gotten yet (health policy research, so at least it's relevant). But they granted it anyway.
Good luck!