Burgh, thanks for the info . . . you did, however, forget Depaul. Any tips for getting in off the waitlist? I'm planning to visit NU next week, then hopefully write a letter of continued interest about how special my visit was.
Ahh DePaul, I knew I was leaving someone out. And I was just in their neighborhood two nights ago for wings and beer.
As far as the WL goes, I don't know of anything specifically helpful for NU. I got into Michigan off the WL last year after staying in continued contact with the dean herself and the admissions office. I sent a couple e-mails reiterating that Michigan was one of my top choices and that I was really hopeful about getting in. I think I even let them know I was in at NU and needed to make up my mind soon - from what I understand dropping the names of other schools that "compete" with the school you're trying to get into can be enticing.
I see you're in at UoC and I know NU loves to steal students away from them, so if you have a particular, compelling interest you'd rather be at NU than UoC, emphasize that.
[EDIT] Whoops, my bad - I just realized you didn't get into UoC. So nevermind that last piece of advice
Conversely, I was WL'd at WUSL, where I expected to be a near "auto-admit" based on LSN's numbers and my success at several higher ranked and comparable schools. However, WUSL was the one school I showed absolutely zero interest in after mailing the application. I never called or e-mailed to check on my status. I didn't stay on the WUSL waitlist, so I'll never know if I might have eventually been admitted there. But the lesson seems to be that these schools really keep track of the little, personal signals you send - or lack thereof.