One of the coolest scripts that came along with Blender 2.46, is the TreesFromCurves. This script was developed for the Peach Project, to create trees and brushes. If you want to know the basics of how this script works, Ideasman42 has produced a video tutorial, showing the basics to create a tree model.
3D Tutorials 
One of the coolest scripts that came along with Blender 2.46, is the TreesFromCurves. This script was developed for the Peach Project, to create trees and brushes. If you want to know the basics of how this script works, Ideasman42 has produced a video tutorial, showing the basics to create a tree model.