commentsMuni bonds are back ... sort ofBy Ken Sweet, contributing writer June 8, 2011: 5:57 PM ET For more on this muni bond ETF, click chartNEW YORK (CNNMoney) -- The muni bond market is showing signs of life but experts caution that it may be too early to call a full blown recovery.Cities, school districts and other local government entities are on track to sell $7.33 billion in municipal bonds