It depends on what your goals are in learning latin, and if you want to learn Medieval or Classical latin - they're rather different, in the way that medieval and modern French are rather different from each other. It also depends on how strong you are at learning languages on your own. I'm absymal at it, and thus rely on courses.

If all you need are some materials to work with, Wheelock's Latin Grammar book is the way lots of people - including myself - began. It has plenty of excercises to work through and a correction key for many of them at the end. For straightforward, overwhelming amounts of raw grammar, Charles Bennet's Latin Grammar book is pretty good.

But if you really want to learn medieval latin, there are a number of particular places at which do courses in it, including summer courses at Notre Dame and, of course, the University of Toronto. I regularly run across brochures and posters for more courses, sessions, and workshops on learning medieval latin if you're interested in working through it that way.

Once you have the basics of grammar down (whether you acquire it through a classical or medieval class doesn't much matter when it comes down to the absolute basics), you might want to work through one of the major readers or reading series to get practice in.

Like any language, if you really want to get it down, the more reinforcement the better. If you have more questions, I'd be happy to try answering them, or I can pass them on to friends who are currently teaching the summer medieval Lating course here.

Toronto's a good program, and if you come in on PhD track (yes, even if you're only going to do an MA and have no real intention of continuing), you'll be fully funded, under the new, one-year-old guarantee. If you're not part of the small golden cohort, however, you're at the mercy of what you can afford, are willing to take out in loans, or can win in the way of other awards. (I just don't know that much about the Notre Dame program which is why I'm not saying more)

One of the women in Latin this past year is in the Art History program. If you're curious, I can put you in touch with her.

As for the Centre for Medieval Studies, latin is the be-all and end-all of the commonality the students have in common. Although you're free to do take classes however you choose, many history students only take history, and many language students only take languages, but everyone takes latin. It's a good bonding experience. Although it helps coming into the program with some background in Latin and makes it much, much easier to complete the MA in one year, there are plenty of people who arrive here with no latin background to speak of, and there is a beginning latin class that's offered in addition to the others - and people going through it do regularly still pass the MA latin exam at the end of the year.

Speaking of which, there are a relatively large number of Smithies here doing medieval things of various sorts (1 in history department, 2 at the Centre, 1 in History of Science).

I learned in high school from the Cambridge Latin series. Haven't kept it up but I do still remember the basics 11 years on, so it must have been decent. I think if you start only with a hardcore grammar text you might find it pretty heavy going. Eheu!