The site lists every position and then provides real writeups from Walsh explaining his philosophy on those positions. I think Pete Carroll is the Bill Walsh of the 21st century, and they even worked together briefly (Carroll was 49ers DC, Walsh a 49ers consultant). Pete considers himself a protege of Walsh, and Walsh apparently reciprocated that admiration. Both Walsh and Carroll are incredibly brilliant, and we are lucky to have our head coach.
Walsh was an intellectual above all else, and his ultimate goal was about making football a thinking man's game. His stuff is always a great listen/read. Read how he starts off his analysis on QBs, and try not to think about Russell Wilson:
To become a great quarterback, there must be instincts and intuition. This is the area that can be the difference between a very solid quarterback and a great quarterback. This isn't an area you can do much with as a coach. You can certainly bring a quarterback up to a competitive standard, but to reach greatness the quarterback must possess that inherently, ala Billy Kilmer, Sonny Jurgensen, Ken Stabler and Warren Moon...
This is where the great quarterback uses his experience, vision, mobility and what we will call spontaneous genius. He makes something good happen. This, of course, is what we saw in Joe Montana when he pulled out those dramatic victories for Notre Dame.
There is a lot more, too.