Hi, Kiwi. I was rejected last year after being on the waitlist for a couple of months (I interviewed late in the cycle). I met with Dr. Samson also, and he just told me to keep up on current events, which I did. I rewrote my statement, rewrote and organized my activities (both on AAMC app), and had an awesome interview. I was placed in the competitive pool (in early October) and languished until this week when I was rescued. I didn't write any LOIs or anything like that. In other words, I didn't DO anything differently during the year.
It is my understanding that the school favors reapplicants because it shows determination. I think more than 25% of the class is composed of people who applied at least twice. Hedging my bets, however, I applied to lots of different schools this year and I was accepted to and prepared to go elsewhere. They wanted to see that, too (I only applied to UW last year), I was told.
I hope that helps...