A collection of useful Collecting links

Japanese Mini-LP CD Fakes and Forgeries
How to distinguish faked Japanese Mini-LP CD's from originals
Jazz Collector
Great site devoted to Jazz collecting, with info on rare vinyl pressings
The Longbox Society
A site dedicated to preserve and document the original Picture Longboxes used for CD's released in the USA
A site with a lot of information on CD collecting: early pressings, limited editions, revised covers, and more

Wikipedia entries for some vintage and less known formats