Below are links to a couple of good articles about the coin market and selling your coins. Both articles are written by Susan Headley at coins.about.com who is about as unbiased a writer as you will find in numismatics. You will find a lot of great advice here especially if you are new to coins and are looking to sell a collection you may have inherited.
Insider's Secrets to Selling Your Coins
Insider's Tips for Buying and Selling Coins
Or visit the main page at coins.about.com