Eastwoods Nursery in Va. has a CD of Acer palmatum cultivars complete with growing hints, many pictures and a searchable data base of 470 cultivars with 1750 pictures and a pronounciation guide. When I saw this for $30 I decided to give it a try. I like it and for the modest price I think many Acer fanciers would find it a handy reference as well. See http://japanesemaples.com/ I have no relation with this business, just a satisfied consumer.
The eastwoods guy grows nice plants. He was a regular at the Philadelphia Flower Show for many years. I bought a plant or 2 from Eastwood and also Book for Maples, i found him to be quite knowledgeable. I want the cd!