If I were you I'd keep those letters/haiku's coming.
I would strongly second this advice. I have no more insight into the mysterious workings of UVM's admissions process than anyone else, except for one thing:
The school seems unusually responsive to repeated, and fairly frequent, expressions of interest by waitlisters. Take me: my stats are fairly ugly by most people's standards, but I got in after my sixth LOI! I sent an LOI to get an interview, one right after the interview, one after I learned I was on the WL (Feb), and then monthly after that. (In fact, I sent two in May.) I also called them once, and would have done so again had I not been admitted first.
Others who have been admitted, both this year and previously, report similar experiences. So send LOIs, because UVM really does care about them! Given the fact that it's now June, I'd be sending them biweekly rather than monthly, and possibly alternating emails with phone calls. (I.e. call one week, email the next.) Keep it brief, polite and cheerful, but let them know how interested you still are, and WHY. My gut tells me that UVM tries to pick the people who seem like the best fit for the school, and really know why they want to be there.
I think this also may have something to do with their refusal to disclose waitlist positions. Most of the schools that tell you your exact rank on the waitlist have rankings that are set in stone, and will never change for any reason. (Example: someone I know on the nontrad forum was told she was #69 on the Mizzou WL. She did get in, BTW.) No matter how many LOIs you send a school like this, it won't move you up the ranks. But I have a feeling that the UVM waitlist is considerably more dynamic, and much more amenable to the applicant's expressions of enthusiasm for the school, so telling you you're number X might not be very meaningful.
Don't get me wrong: I think UVM's system is much too mysterious, and incredibly hard on the applicant. But the silver lining is that I think you can help yourself quite a bit by showing a lot of interest in the school.
Good luck everyone.
