iShares recently launched a series of municipal bond exchange traded funds with planned end dates.

Each of the six new funds within the iShares Muni Series holds a basket of AMT-free, investment grade, noncallable, national municipal bonds that mature in a targeted year. When each fund reaches its planned distribution date, it will distribute substantially all of its net assets to then current investors. The new exchange traded funds include:

iShares 2012 S&P AMT-Free Municipal Series (MUAA)
iShares 2013 S&P AMT-Free Municipal Series (MUAB) 
iShares 2014 S&P AMT-Free Municipal Series (MUAC) 
iShares 2015 S&P AMT-Free Municipal Series (MUAD)
iShares 2016 S&P AMT-Free Municipal Series (MUAE)
iShares 2017 S&P AMT-Free Municipal Series (MUAF)

For more ETF investing choices, see the Fixed Income – Tax Exempt  ETF directory.