[ http://www.australianbanknotes.net/ ]
Provides a history of Australian banknotes with images and also valuations.
[ http://brokenbanknotes.com/ ]
Provides an online forum for enthusiasts to take about obsolete notes and currencies.
[ http://www.icollectit.co.uk/ ]
Features all types of autographs, signed cards, autographed photos, autographed memorabilia and collectibles.
International Federation of Postcard Dealers
[ http://www.playle.com/IFPD/ ]
Aims to encourage professionalism, increase confidence, strengthen ethics and promote the postcard hobby worldwide.