Your pal the search funcion sure can.
Seriously though... I've answered this question so many times I just search for my name and "Letter of Intent"
Below is the template I wrote that I usually post when somebody asks about letters of intent.
Usually, a letter of intent is reserved for when you have been waitlisted, although, I suppose it could be sent sooner. I wouldn't send one pre-interview.
The view on multiple letters of intent is somewhat split on SDN. I am adamantly opposed to sending more than one, I feel it strikes against your credibility. But there's not much more it can do... so I guess it's your decision.
(Address to Dean of Admissions)
Paragraph 1: As you may know, I am currently on the waitlist. I am writing to state in no uncertain terms that it is my intent to attend XYZ medical school. If accepted I will withdraw all outstanding applications to other medical schools and begin the process of enrolling at XYZ medical school.
Paragraph 2: Kiss ass. Tell them why you love the school so much. Give details.
Paragraph 3: Closure. Include details about how you may be contacted since you are on the waitlist. (e-mail, home mailing address, phone, any alternate phone numbers, etc.)
Thank you and I hope to see you in August,
Your name
Your AMCAS ID
^Type and Sign
^seriously, I copied this exact post verbatim from the last time this was asked