As I mentioned, I got a ton of information on rat care from the Internet. It is still my first stop when I have a question about the rats (primarily because rats never seem to display new symptoms or alarming behavior during regular vet office hours!) Listed below are many of the sites I refer to and enjoy. In fact, I decided not to put too much basic rat care information on my page because it would be reinventing the wheel--these folks have already done the work, and done it well.
Here's the list, in no particular order. It is by no means exhaustive, though, and as time passes you may find broken links. I also can't take responsibility for the information on these pages. And while gathering your own information on the web can be very useful, if you have a medical question or concern about your rat, don't hesitate to call your vet.