A good bond site to visit is bonds.yahoo.com, which has loads of useful information.

Online bond calculators are available at personal.fidelity.com; interest rate information is available at money.cnn.com/markets/bondcenter/ and www.bankrate.com.

Follow the "Bonds" link at investorguide.com to learn more about bonds.

Current market rates are available at www.bankrate.com.

Information for bond investors can be found at www.investinginbonds.com.

Information on individual bonds can be found at www.bondsonline.com and www.bondresources.com.

The Bond Market Association Web site is www.bondmarkets.com.

Want detailed information on the amount and terms of the debt issued by a particular firm? Check out their latest financial statements by searching SEC filings at www.sec.gov.

Want to know what criteria are commonly used to rate corporate and municipal bonds? Go to www.standardandpoors.com, www.moodys.com, or www.fitchinv.com.

Another good bond market site is money.cnn.com.

Official information on U.S. inflation-indexed bonds is at www.publicdebt.treas.gov/gsr/gsrlist.htm.

To learn more about TRACE, visit www.nasd.com and select Market Systems.

To purchase newly issued corporate bonds, go to www.direct-notes.com or www.internotes.com.

The Federal Reserve Bank of St. Louis maintains dozens of online files containing macroeconomic data as well as rates on U.S. Treasury issues. Go to research.stlouisfed.org/fred/files.

To buy Treasury bonds directly from the government, go to www.treasurydirect.gov.

Current and historical Treasury yield information is available at www.publicdebt.treas.gov/of/ofaucrt.htm.

Online yield curve information is available at www.bloomberg.com/markets.

Check out the "living yield curve" under "Economy & Bonds" at www.smartmoney.com.