@patrickbateman said:
Are there more tree libraries available for it from anywhere?
Only what is on their website. They don't allow commercial packaging of prebuilt speedtrees. The trees they have are pretty great though. Most of them are in Lumion. I don't think anyone would seriously buy the software to get the premade trees, in the same way you wouldn't buy 3dsMax to get the sample scenes. It's a modeler, and a bad ass one at that! Also, I don't think any of them would work too well in sketchup though.
[flash=800,600:2d98c46j]http://www.youtube.com/v/g10NDl6HdD4[/flash:2d98c46j]