Tournament Organization

LeaguePro Interactive Sports Websites - Provides website and league management services.
http://www.leaguepro.com/

Tournament Designs - 12 teams wish to play an all-play-all at 6 venues over 11 rounds. Schedules for such all-play-all tournaments up to 26 players, and for carry-over tournaments up to 16+16=32 players, in HTML, PDF and txt formats.
http://www.jdawiseman.com/papers/tournaments/tournaments.html

Tournament Organisation - General-purpose advice for tournament organizers, specifically in the context of Ultimate Frisbee, but more widely applicable.
http://www.afda.com/showcontent.php?page=tourney_resources

SportsNuts - Helps organize and manage sports events, providing online registration, coordination, promotion, and merchandise sales.
http://www.sportsnuts.com/

Sports Draw - Given a list of competitors does the draw for a knockout competition.
http://www.sportsdraw.co.uk/

Tournament Organizing - Advice for orgainzers of Go tournaments, with particular emphasis on the judicial aspects (which would apply equally to a tournament of any similar game).
http://www.kttl.helsinki.fi/msiivola/rr_commission/tournament.html

Tournament Management - Includes a detailed explanation of the Swiss design.
http://www.oxfordcroquet.com/manage/index.asp

Universal System of Rating a Macrotournament - Mostly in Russian, with one English page on a general theory of rating tournaments.
http://www.rt.ustu.ru/