For example, is it a general obligation bond or is it tied to a specific tax or revenue stream?

FORBES: Rewards May Exist In Muni Bonds

While they yield a little less than a state general obligation bond, they are perceived as having less volatility.

FORBES: More Colleges See Bonds Downgraded

In the General Obligation muni bond space, stick with states whose present budgets and unfunded pension liabilities appear somewhat manageable.

FORBES: Finally, An Easy Way To Get Timely Municipal Bond Data

To reduce interest-rate and default risk, Ms. Benz suggests sticking with intermediate-term muni-bond funds with a high percentage of their holdings in general-obligation bonds, which are repaid with tax revenue.

WSJ: Conquering Retirement: The Case for Muni Bonds

And his ten-year-old Deutsche Municipal Bond Fund did 7.26%, versus 5.98% for the Lehman Five Year General Obligation Index, putting it in the top 4% of its class.

FORBES: Yield Booster