Coin Tips

Ancients:

Ancient Greek, Roman, Byzantine, and Celtic coin reference, attribution and valuation - Excellent
http://www.wildwinds.com/coins/
http://www.forumancientcoins.com/ancientwhitesheet/links.html

Parthian Empire, history and photos lots of details - Excellent
http://parthia.com/

United States:


Notre Dame Collections: Colonial Coins and Currency, lots of details and photos
http://www.coins.nd.edu/

Hard Times Tokens useful for identification and type cross reference
http://www.hardtimestokens.com/

The Token Catalog
http://www.tokencatalog.com

VAM World for Morgan and Peace Dollar VAM die varieties
http://www.vamworld.com/

The Banknote Wiki - Obsolete and National Banknote History
https://banknotehistory.com/wiki/Main_Page

World Coins:

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.
https://en.numista.com/

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.
http://www.banknote.ws/

The International Banknote Society has a very complete introduction to world banknotes and collecting them. 
http://www.theibns.org/intro-to-banknotes/

The Banknote News has the latest on new issues with images of many world banknotes. 
http://www.banknotenews.com/

Coin Newspapers:

Coin World has several publications which mey be of interest to collectors. 
http://www.coinworld.com/

Numismatic News has several publications which may be of interest to collectors.
http://www.numismaticnews.net/

Miscellaneous:


NBS - Numismatic Bibliomania Society and the E-Sylum. A great source of information
http://www.coinbooks.org

Boy Scouts Coin Collecting Merit Badge - here are the requirements
http://www.scouting.org/filestore/Merit_Badge_ReqandRes/Coin_Collecting.pdf

Mint Error News - mostly US coins, photo museum, definitions, value guide, list of foreign coins made at the US Mint, etc.
http://minterrornews.com/