I used to have a small collection. It didn't fare well when I moved out to Oklahoma. I will be buying up some new trees and starting again this year.
If you're interested in some fantastic information on how to do them properly, check out Walter Pall's site. He has a site with tons of pics of his trees, and a blog where he discusses all kinds of stuff from pruning to soil to watering to artistic design. He's one of the best bonsai artists in the entire world (my favorite personally), and an enormously useful source of information for doing bonsai trees properly. Information he shares very freely with anyone and everyone.
If you look through his gallery, his trees are the most amazing, beautiful bonsai trees I have ever seen...and he has hundreds of them. He even has a history of many of his trees, some of which go back 30 years. You can see the progress of the trees in the pics, and he'll given explanations of what he's done along the way. He goes over then when and why of everything he did to the tree. Root prunings, top prunings, defoliations, wirings, repottings, period of wild growth to build up trunk size or to fill in the apex...it's all there, and it's all free.
Site with galleries (WARNING: you will spend hours looking at the trees if you find this stuff interesting)
http://www.walter-pall.de/
Blog (with almost daily updates from one of the best bonsai artists in the world)
http://walter-pall-bonsai.blogspot.com/
Just one example (and probably my favorite deciduous tree he has):
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