The most comprehensive source of information about U.S. coin prices is the Red Book, formally known as the Guide Book of U.S. Coins by R. S. Yeoman, published by Whitman Books. It includes prices in several grades for pretty much every coin made in or for the U.S. since colonial times. Prices in the current year's book, in my experience, usually tend to be a little high; unless prices are moving really fast, I generally find that the prices in a Red Book that is a year or two out of date tend to be more useful for the more common collector coins.

Periodicals that provide useful price lists are discussed in the Publications page.

Numismedia offers a free on-line Collector Price Guide for circulated U.S. coins. They offer a "Dealer Price Guide" to paid subscribers that covers uncirculated U.S. coins.

PCGS offers a Price Guide for U.S. coins as well, focusing on more valuable coins that are likely to be submitted for grading. It has prices for the more valuable coins in circulated grades but its strength is the listings of uncirculated coins.

Here is a price list of Canadian coins that does not seem to have been updated for some time (as of Dec. 2006).

Books providing prices for Canadian and other world coins are discussed in the Publications page.

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Precious metal price quotes (many metals, many markets, both current and historic) may be found at Kitco Inc.'s Near-Live Market Update.

Here are charts showing the prices over the last 24 hours for silver and gold:

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The Pacific Exchange Rate Service is run by a professor at the University of British Columbia. You can get current prices as well as extensive historical information on just about any currency that has a market price, and you can get it in any terms you want. How many yen to the dinar? PERS knows. You can download historical data to a spreadsheet or you can ask the computer to draw a graph for you.

Here are some other currency exchange rate websites:
XE.com
Oanda.com
Yahoo finance

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