Ancient Greek, Roman, Byzantine, and Celtic coin reference,
attribution and valuation - Excellent
Parthian Empire, history and photos lots of details - Excellent
Notre Dame Collections: Colonial Coins and Currency, lots of details
Hard Times Tokens useful for identification and type cross reference
The Token Catalog
VAM World for Morgan and Peace Dollar VAM die varieties
The Banknote Wiki - Obsolete and National Banknote History
Numista - this site covers a wide range of coins. It includes photos
and mintages, well organized and easy to use. They try to cover
everything, even Condor Tokens.
World Paper Money:
The Banknote Museum has a very complete set of images of world
banknotes with Pick numbers. It is a great place to look when you
can't quite identify one of your notes.
The International Banknote Society has a very complete introduction to
world banknotes and collecting them.
The Banknote News has the latest on new issues with images of many
Coin World has several publications which mey be of interest to
Numismatic News has several publications which may be of interest to
NBS - Numismatic Bibliomania Society and the E-Sylum. A great source
Boy Scouts Coin Collecting Merit Badge - here are the requirements
Mint Error News - mostly US coins, photo museum, definitions, value
guide, list of foreign coins made at the US Mint, etc.