Botvinnik, Mikhail

Chess World Champions: Mikhail Botvinnik
Features a biography and game playable through a java applet.
http://www.chesscorner.com/worldchamps/botvinnik/botvinnik.htm

Fide Title Tournament 1948: Botvinnik
Features downloadable .PGN Games, crosstable, and key game positions of 5-player tournament (Smyslov, Reshevsky, Keres, Euwe) held after Alekhine died holding title.
http://www.mark-weeks.com/chess/48$c$wix.htm

World Chess Championship 1960: Tal - Botvinnik
Provides .PGN games, crosstable, and key game positions from this FIDE match.
http://www.mark-weeks.com/chess/58601wix.htm