OSU Virtual Finance Library
http://www.cob.ohio-state.edu/dept/fin/overview.htm
From Ohio State University's Department of Finance.

CNNfn
http://cnnfn.com

Silicon Investor
http://www.siliconinvestor.com
Includes historical daily stock prices.

GSI World Exchange Links
http://www.gsionline.com/exchange.htm
from Global Securities Information, Inc.

Learn About Investing
http://www.sec.gov/consumer/blearn.htm
From the Securities and Exchange Commission.

MultexInvestor
http://www.marketguide.com
Many parts free. Library does not subscribe to fee-based services.