Cabela's web site has an online fly fishing university with good information and terminology for beginners.

http://www.cabelas.com/assets/cms/im...3Bcat112554180

It covers topics of fly reels, rods, line, leaders, basic entomology, casting and knots. When the course is completed you get a code that is good for a free one year membership in the Federation of Fly Fishers. It can be completed in about 15 - 20 minutes.