positive thinking, positive thinking! I love NW and have less chance to get in than just about anyone I've seen applying...but I'm keeping my hopes high, sometimes that's all you've got! chin up and good luck! I'll be pulling for you...
and for the person interviewing, I did one, but it was off-campus, so probably different than yours, but it was a really great experience, I wasn't sure about applying until I did the interview and I learned a lot from the interviewer and was impressed with the questions and such, so I figured, hey I'll donate some $$ on the off chance... basically my only advice would be be yourself and make sure you ask good questions, too, I think that really helps make you stand out above people who just answer the questions they ask you...
good luck all you NW hopefuls!