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Chess World Champions: Mikhail Botvinnik
http://www.chesscorner.com/worldchamps/botvinnik/botvinnik.htm
Features a biography and game playable through a java applet.
Fide Title Tournament 1948: Botvinnik
http://www.mark-weeks.com/chess/48$c$wix.htm
Features downloadable .PGN Games, crosstable, and key game positions of 5-player tournament (Smyslov, Reshevsky, Keres, Euwe) held after Alekhine died holding title.
World Chess Championship 1960: Tal - Botvinnik
http://www.mark-weeks.com/chess/58601wix.htm
Provides .PGN games, crosstable, and key game positions from this FIDE match.