Here's a question to trick a lot of chess fans out there....
Star Trek 3D Set http://www.chess-theory.com/encprdo3886_chess_practice_reflections_debates_arts.php
"Grand Chess" http://www.zillions-of-games.com/NewFeatures.html 
"Engagement Chess" http://www.quadibloc.com/chess/ch0204.htm 
"Grid Chess" http://en.wikipedia.org/wiki/Grid_chess 
"Gothic Chess" http://www.chessville.com/gothicchess/gothicchessintro.htm 
"Neo-Chess" http://ancientchess.com/page/10.htm 
"Shogi" (Japanese Chess) http://www.chessvariants.org/shogi.html 
"Four Seasons Chess" http://www.chessvariants.org/historic.dir/4seiz.html
"Toroidal Honeycomb Chess" http://chessvariants.wikidot.com/toroidal-honeycomb-combined-courier-chess
Played with marbles http://homepages.di.fc.ul.pt/~jpn/gv/dob.htm
Played with cards http://www.gamedev.net/columns/events/gdc2003/view.asp?SectionID=2
Nine knights? http://www.quadibloc.com/chess/ch0402.htm
Four player corner chess http://blogs.indystar.com/geek/2008/08/
Three player hexagonal board http://www.mastersgames.com/cat/board/chess-3-player.htm
Star-shaped chess http://newton.umsl.edu/philf//nplchess/
Four player chess http://www.academicchess.org/contact/linkspages/chess-variants.htm
Expanded board "Super Chess" http://www.freepatentsonline.com/6702287.html
One player chess http://newton.umsl.edu/infophys/wuzzlers.html
Five player chess http://www.quadibloc.com/chess/ch0205.htm
"Martian Chessboard" http://www.ee0r.com/tri-chess/
Six player circular board http://kentropic.wordpress.com/ 
Three player circular board http://www.douglaswilliamsmith.net/Trinity_Chess/Three_Player_Chess_Comparative_Review.htm (this site has a few other variants, such as trigon chess) 
Three player chess with hexagonal squares http://www.thetoyman.com/top_50_2009.html
What kind of marks do chess players get in school?
Hohmeister - Frank, 1993 (12 moves)
