My favorite for just about any conversion you can think of:
http://www.onlineconversion.com/
B'Dog
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2006 Gary Fisher Marlin MTB
2004 Salsa LaRaza aka "Mmmm, Blue Salsa" (853 steel is real, baby!)
2003 Kona Humu Humu Nuka Nuka Apua'A Singlespeed - Gone, but not forgotten
1998 Diamondback Outlook MTB
1990 Centurion Cavaletto 'Gaspipe Beater' Roadie
1978 Volkscycle 'Frankenbike' CroMo Tourer