I'm a big fan of the 'kick-and-tell' "my true story of football, music, violence, and fashion" type books. They are probably 99% bullshit but an interesting insight into a very different time. My favourites are 'Bovver' for its discussion of glam rock hooligans in platform boots and glitter paint, 'Who Wants It' because its written by the lead singer of Combat 84, 'Congratulations you've met the ICF' for its chapter on Sham 69 and Kidz Next Door and Stinky Turner's autobiography, which is for all intents and purposes a a hooligan book.
I second all the recommendations for Bill Buford's book, which is one of the few intelligent ones out there. Its worth reading just for the part about the National Front disco, where he describes all the yobbos pogo-ing to Skrewdriver while the posh older men, including British National Party leader Nick Griffin, look on.
Lots of good documentaries out there too...
The 1985 ITV 'hooligans' documentary on the ICF is probably the most iconic one:
http://vimeo.com/40000709MacIntrye infiltrated the Chelsea Headhunters in the 1990s:
http://www.youtube.com/watch?v=y0nadafM3fY1977 Panorama special on Millwall:
http://www.youtube.com/watch?v=fDUSELk5j2s2001 BBC documentary:
http://www.youtube.com/watch?v=7GrME2s1vmkThat 'Real Football Factories' programme is terrible but worth watching the second season to see how terrified Danny Dyer is when his supporters' bus gets shot at in Brazil.
Nowadays in Britain its just middle-aged guys who can't give it up, and the occasional youngster, but nowhere near the mass phenomenon it was in the 70s and 80s. Very well-coordinated these days... fights organised by text message, away from the grounds and the police. It does kick off on a larger scale every now and again though, there was lots of trouble.
Football in Latin America and Eastern Europe seems like Britain in the 70s, only more violent