honestly, you can learn it quickly and easily just going to a casino during a slow time and stand next to a dealer on the corner. thats how I did and learned it pretty quickly.
basically, there are two things you should know. if there is a point established or not. meaning, on a new game a player rolls the dice and 7/11 will pay if you bet the "pass line." once the player rolls a 4,5,6,8,9 or 10 then a point is established. if a 7/11 is rolled before that point is rolled again you loose (assuming you bet the pass line).
if you be the pass line and the point is hit, you get paid 1:1 on your bet. just take a few bucks and put it on the passline, you will see how easy it is to learn
edit: btw, if you have an iPhone, they have a cool craps game you can download and play. its called "craps deluxe"