Okay, one last update from me. Got the car back from the dealer... they "reprogrammed" or "reflashed" the car's computer due to the engine vibration (under warranty). It seemed to improve things, but it is hard to tell. Really the big change that I notice is the RPMs seem higher - kind of a cheap way to "fix" something. The service manager told me that I may not notice a big difference.
As I said before, I am going to look into the engine mounts when I get a chance.
I don't know... the car runs fine (no stall, no stumble, plenty of power), just has this vibration that I think is excessive. I may just have to chalk it up to an engine with 60,000 miles on it.
Thanks for everyone's responses here!