That Helm's Deep parody was real great! I really need to start watching The Simpsons again...
Here's an outtake from TTT, that was actually discussed in the cast commentary. Perhaps it's already been posted elsewhere, but I think makes a great addition to this thread:
Outtake
A little something from Family Guy:
Sauron Lost His Contact Lens
And after a long time searching, I finally found the SNL clip of Elijah Wood and Chris Kattan as Gollum back in 2003. I know most have probably seen this already, but I thought I should still put it up here:
A Hobbit Hard to Break (you'll have to scroll down a bit to find the link to the video)
An FotR set test of Bag End with Peter Jackson filling in for Bilbo. As a film major, I find this clip quite interesting...though I'll admit, the floating head is rather hilarious:
Bag End Set Test
That's all I've got for now...