I've been watching this dudes movie reviews since he was just on youtube and was doing star trek reviews. He's a genius both comically and with his dissection of bad movies.
www.redlettermedia.com
If you haven't watched any of his reviews yet, start with either Star Trek Generations or Phantom Menace. Both are comic gold and had me howling with laughter.
His latest work is going to be the review for Ep 3. I kid you not when I say the anticipation for this review is white hot with red letter geeks like myself. He keeps teasing it and then throwing us reviews of weird movies like "babys day out". The way he unveiled the preview for ep 3 was so great too
The review for the Phantom Menace had a great trailer too:
His use of Pizza Rules is awesome.
On to the reviews

Star Trek Generations
My personal favourite, the review of Generations. I think it's cuz I'm a huge TNG fan at heart. I suggest watching every single review of the Star Trek movies if you're a fan like me.
Star Wars Phantom Menace
The movie review that made him famous. 7 parts of genius. Enjoy. His dissection of what the movie does wrong is amazing. Watch part 1 and you will see what I mean; his character analysis is brilliant and helps you understand why you hated the movie, even if you couldn't explain why in great detail.