Attached Link: http://http://www.brycetech.com/

Bryce Tech has a pretty good tut on trees. Also in Bryce 5 (not sure if this works in other vers) When you choose to create a tree in bryce, hold the alt key and a small explorer will pop up with some very nice pre made trees. There are not alot of them, but enough to give you a good start so you can learn from them. hope this helps ICM