Here are some of the most helpful links that I know of. Please add any that can help collectors. We could use a good retail price guide. A.N.A. http://www.money.org US Mint http://www.usmint.gov coinfacts http://www.coinfacts.com American Numismatic Society http://www.amnumsoc.org/ Bureau of Engraving http://www.moneyfactory.com Royal Canadian Mint http://www.amnumsoc.org/ British Royal Mint http://www.royalmint.com/ Austrian Mint http://www.austrian-mint.com/ American Medallic Sculpture Association (AMSA): http://www.amsamedals.org/ Combined Organizations of Numismatic Error Collectors of America (CONECA): http://conecaonline.org/ Coin Shows http://www.coinshows.com ANA Coin Clubs http://www.money.org/othersites-clu.html ANA Sites of Interest http://www.money.org/othersites-num.html The Coin Dealers Newsletter (GreySheet) http://www.greysheet.com Coinage Magazine http://www.coinagemag.com/ CoinWorld http://www.coinworld.com PCGS http://www.pcgs.com NGC http://www.ngccoin.com IGC http://www.icgcoin.com/ ANACS http://www.anacs.com/
For British stuff here is the definative site... http://www.tclayton.demon.co.uk/coins.html (includes a section with a price guide for milled coins, both Early and Late).
Hey ND - you mentioned an interest in ancients. You can start here - Coins The gentleman who built that site knows more about them than anyone I personally know. He is also a WINS member - so it will be quite easy for you to contact him and talk about them
All kinds of information, supplies, websites, coin values, etc, can be found within http://dir.webring.com/rw?d=Hobbies___Crafts/Collecting/Coins_and_Currency Not only that, if you have a coin website, be it informative, buying/selling of coinage or supplies, you can get some free advertisement by listing your site in one of the webrings, or many of them. All you have to do is post a banner for the webring on the site page you wish to link to. Fair enough. I recently took on a webmaster position of this one:http://v.webring.com/hub?ring=coinlinkwebring Look around through all of them. You can spend hours in there.
Here is one I use all the time, you only have to join if you want to look up proof and uncirculated coins; a2J jess www.numismedia.com
Recommended reading: A guide book of United States Coins. (red book) Walter Breen's Complete Encyclopedia of US and Colonial Coins. Any book written by Q. David Bowers or Scott Travers.
I have started collecting world coins and these are a few sites that I have found useful: http://www.blackmountaincoins.com/ http://www.joelscoins.com/ http://www.worldcoingallery.com/