I have Unity 3 Pro, and I can't find the Pro Standard Assets.unitypackage or even the Standard Assets in c:\program files\unity\editor\standard packages
Am I supposed to see that file here? If so, what should I do? THANKS!!
This is what I see: 
In Unity 3.0, "Standard" assets are broken into several packages now to help reduce the size of projects. So now you pick and choose what Unity-provided assets are included in your project based on your needs. In the screenshot you posted, the packages with `(Pro Only)` in the filename correspond to the updated versions of Pro Standard Assets. As far as I know, they maintain similar directory structures as 2.x, so they should import as though they are a small part of what was previously the `ProStandardAssets.unitypackage`.