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I talked to my friend about Google Sketch up. and according to him the free version no longer has the nice trees ans stuff. In order to get that evidently you may have to pay out the nose for the...

I looked into the the newest Blender due out next month, and it looks to be awesome. So you may want to look into that.

In my opinion Sketchup is much easier to use than is Blender although Blender has a few pluses not found otherwise such as the ocean simulator.

As others have said. it depends on what you want to do. I have an Architectural delineator friend that uses google Sketchup free version.,