Below is a list of links to some useful rapier sites. If anyone has anything to add feel free to reply with a link.
Mid-Realm Marshal's Handbook and bladetypes and conventions: http://www.midrealm.org/marshal/rapier.php
Photo's of Mid-Realm fencers titled "Who's dat fencer?" : http://michiganleftturn.org/Fencer_ID.htm
Marco's website, containing a "Historical Combat Master's Reference" sheet and other resources: http://www.marco-borromei.com/
Mid-Realm Wiki Rapier Combat page: http://middlewiki.midrealm.org/index.php/Rapier_combat