Currently a 1st year GMS (a.k.a. MAMS) student at BU. I got good advice on StudentDoc last year about the program, so, just returning the favor. Feel free to PM me if you have any questions about the program. But, please don't ask me questions that have already been answered here.
I also agree with some of the other posters in this forum about housing. It costs more to live closer to the med campus, but depending on your personality, it might be worth it. I live right across from school and it takes away a lot of stress not having to worry about traffic. Boston traffic is HORRIBLE! Especially during rush hour or on Massachusetts Ave (a.k.a. Mass Ave) where there's almost always constuction. So, yes, it might cost a bit more, but an hour commute each way from the med campus to Allston/Brighton area (near main campus) is not worth it to me. That's 2 hrs out of my day wasted, when I could be studying. Because you will be STUDYING your little butts off in this program. Not only does it save time and stress living closer, but it's more likely you'll make it to more classes. It gets COLD + snowy during the winter, and when lectures are available online and your apt is nice and cozy, you're going to be less inclined to suffer outside to get to class.
The two current popular across-the-street housing options are BU-owned Harrison Court + James Court. IMO, Harrison is kinda grimy and very poorly ventilated. James is newer, cleaner, and has a 24-hr concierge-meaning they can call you cabs, hold your packages (so they don't get stolen or sent back), and spot suspicious ppl coming into the building. Also, James has a small fitness center + allows pets, both of which are not available at Harrison. And the front desk has free coffee + tea all day! I originally almost chose Harrison because it's a LITTLE bit cheaper, but decided on James because the little difference in price was more than made up for with James' amenities. I have friends who pay $1850 and $1900 each for their own one-bdrm in Harrison, while I pay $2000 for a 1-bdrm in James. Not that big of a diff if you're already gonna fork over that much for rent. 2-bdrms in James are around $2650. You can also split your 1-bdrm (in either Harrison + James) by partitioning off part of the living room as a room. This a popular option for many students.
3rd option available starting this Fall is the new 610 Albany apts, which are supposed to be as nice as James and similar price to H + J. I think you'll have to get on the waitlist, though, since I had a friend just get a spot from being on the waitlist.
I'll try to post more later if I remember other questions I had from last year during the admissions process.