Anybody know of any good websites about trees, in particular descriptions of the different species, mature size, preferred soil/climate, growing speed, etc.??

I've been cutting, hacking, slashing, and burning for a year now and we've finally reached the point where we're realistically discussing what we want to put back onto the property. We want to create some screens, some visual features, and some wind control - all things related to trees.

I'm hoping someone knows a good source for all the info relevant to selecting trees for different locations/purposes so my Wife and I can do some "window shopping". I have a few selections in mind, but it's nice to get additional information - afterall there may be better choices available, especially with some of the newer hybrids out there.

Thanks

Gregg