Several chat board exhibitors have put their exhibits online, using variations of a basic 4x4 frame template and scans of pages. Some of these exhibit layouts have become more sophisticated over time, to permit easier navigation systems through the pages and frames (e.g. malolo's exhibits).
de66 Complete Revenue Exhibits - Australia and New Zealand
Perfin Exhibits - Australia
knuden Sudetenland 1938-1945 malolo De Coppet Razor Cancels of Switzerland - Rasierklingenstempel
Types of Swiss Made Cancelers Used in Latin America 1881 to 1936
Processing Mail at the Hotel Schweizerhof, Luzern: 1856 - 1963
Refused Mail of Switzerland [Refusé - Nicht Angenommen]
sheryll*net "New Hebrides / Nouvelles-Hébrides 1892 - 1948" exhibit pages stampmad Postal History of the Brisbane GPO 1840's - 1913
Please let me know of any other exhibits that should be included in this list.