Alan Pollack's intensely rigorous analysis of Beatles songs.
I know a lot of Beatles fanatics, but this guy takes song deconstruction to microscopic granularity. Even if you're just a casual fan, and not interested in the exquisite details of the songs' arrangement, be sure to read Alan's fantastic "Other Thoughts" at the bottom of each page for a more subjective analysis. This site is an absolute treasure chest for anyone interested in the Beatles. Brilliant work.