CoinDay - http://www.coinday.com/
A coin auction site that is first and foremost dedicated to coins with FREE listings.
 

Trading Slabs - http://www.tradingslabs.com
Trade or sell your coins and chat with other coin collectors
 

CoinZip - http://www.coinzip.com
Online Coin Auctions, Message Board, and More!
 

Online Coin Trader - http://www.onlinecointrader.com/
Free Classified Ads and Forum
 

Collectors Society Slabs - http://www.www.collectors-society-slabs.com
Collectors Society Slabs
 

NGC - Numismatic Guaranty Corporation of America - http://www.ngccoin.com/
NGC offers coin grading services, coin certification, and services for coin dealers and collectors.

The Coin-Shop - http://www.coin-shop.com
A Full Service U.S. Coinage Provider

COINSHEET Numismatic Directory - http://coinsheetlinks.com/
COINSHEET Numismatic Directory