Bank Rate : One of the oldest sources of CD and deposit interest rates. The company started with paper subscriptions in the 80s and have made a great switch to the Internet : http://www.bankrate.com    

Bloomberg : This is data developed from the key system utilized by professionals throughout the world. In fact, this is a great summary of global interest rates :http://www.bloomberg.com/markets/rates/

Federal Reserve H.15 Selected Interest Rate Data : This is government data that is used universally by governments and financial institutions. These treasury interest rates  is a great starting point for reviewing interest rates for both deposit and loan interest rates and indexes for adjustable rate loans.  http://www.federalreserve.gov/releases/h15/update/