I love title sequences in movies. It's like a chance to put a self-contained little statement at the beginning of your movie and a lot of films make great use of that opportunity.
Ian Albinson, Founder and editor-in-chief of Art of the Title, put together this amazing collection of title sequences through the years, aptly called The Art of the Title Sequence.
Ahhh, the memories and good times come flooding back. Also, this video gets a big thumbs-up for using music by one of my favorite musicians, RJD2.