i have the r4ds and or people who dont knowwhat that is its a normal ds cartridge that you store games on so u dont havr to pay for them (i dont have it but its coming in the post for my birthday by birthday is in 9 days!!!)
My friend has AR for the DS. He also has the cable that links the AR to the computer, which is pretty much useful only for Pokemon D/P. But there are apparently a lot of useful things that it can be used for, if you are into exploring games beyond what the creators intended.
My bro got the mario cart ds so it came with mario in a gocart little metel thing with a checkered strap, he also got a small case that fits the ds and some games, for talking games he got a head set for the ds and he got things u put on ur fingures for the touch pad.