First off, the New Moon trailer was absolutely brilliant, that's how I see the actual trailer.
The cliff diving one was beautiful.
And the Hitler one about Breaking Dawn cracks me up, be wary though, it has so many spoilers if you haven't read the book.
This video by Arabella18 is my favorite, it is a complete music video regarding New Moon, with Edward leaving Bella, her time with Jacob, the cliff diving, the drive home when Jake refuses to take her back because Alice is there and when Bella goes to Italy. There is a speaking part in the beginning that is beautiful and heart-wrenching.http://www.youtube.com/watch?v=bxLt2fAT-6E
This video is hysterical, don't get offended, it's a parody of one of the songs from the little mermaid "Part of your world" about wishing that Bella would disappear so that Edward would be available. I couldn't look away.http://www.youtube.com/watch?v=AdyO67RrGyM
Finally, this is my first Twilight video I made, I think it's terrible save the ending but it was so much fun to make, I couldn't resist. The quality in parts is a bit off because I had to reduce it since YouTube won't accept a video that's larger than a gigabyte. lol. This is pretty much just a video about Edward realizing his inability to protect Bella. Remembering all the times he's saved her life, wondering if he will ever be able to keep her safe. Please watch the end, it's my favorite part.http://www.youtube.com/watch?v=_EJD0jt80Oo