Thanks for the links, sliedl.
That's pretty much what I thought about Anonymous Proxy and Satellite Provider. I'm leaning towards blocking all three of these. But, I figured it wouldn't hurt to get some input from the community in case I wasn't thinking of some legitimate use of these.
(I had a typo in my original post. I meant to say "Satellite Provider = I have NOT had much time to think this one through.")
I'd love to hear any other thoughts or opinions.