Hey Wicca,
Yeah, the Joan Bunning site (
www.learntarot.com) is based on the Rider-Waite-Smith deck. And it's free.
You can also order a hard copy of the book if you'd rather read something you can hold. Another book I highly recommend for anyone is
Tarot for a New Generation by Janina Renee. She's actually geared the book toward readers in their teens and 20s, but it's really a great book for all ages. She's straightforward without dumbing it down. She also talks in the intro about the use of tarot with the learning disabled and how she really thinks it can help. You should check it out if you can get your hands on a copy.
Kes