My friend Kenny and I put together a package for Unity to auto generate foliage easily on a mesh from within Unity.
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The Modo Vimeo user group came out, so I recorded a video of making a mesh in Modo, importing that to Unity, and then throwing some foliage on to that.
[media]http://vimeo.com/25795617[/media]

Here's some renders of the example scene in the PRO version of Unity.

The unity pro version supports camera effects.

The Ecosysem Generator works in the free version of Unity without the cool camera effects.

We plan on adding many more types of foliage.

An undocumented feature is that you can paint foliage on a mask. I'm trying to work that into an editor script so that it works without having to "play" the scene.

The Unity extension is available in the Unity asset store.
http://u3d.as/1Y1

I've added support to import your own foliage items.

Youtube: [media][/media]

Vimeo: [media]http://vimeo.com/26701662[/media]

[html]<img height="150" src="http://tagenigma.com/a/ecosystemgenerator/2011-08-28%2C%20Ecosystem%20Generator%20Android%20014.png"/>[/html]


Here you can see how to publish to Android and get the Ecosystem Generator working on your phone:
[media][/media]