Little League Issues an Update Composite Bats and Provides List of Approved Bats! 

Little League International placed a moratorium on the use of composite bats on December 30, 2010, but subsequently issued a statement which indicates that several bats have been granted a waiver from the moratorium.  The following is from Little League International's Website - posted on January 20, 2011:

By definition, a moratorium is: An authorized delay or stopping of some specified activity. As applied by Little League International, the moratorium disallows the use of all baseball bats constructed with composite material in its barrel unless a specific model shows in laboratory testing that it will not exceed the standard that is printed on the bat, after the bat is broken in.
 
There is a process through which manufacturers can submit individual models for a possible waiver if they wish to seek it. Individual bat models are tested at an independent laboratory, and the results are conveyed to the manufacturer. If the manufacturer provides the results to Little League, and the bat passes the test, it will be noted on one of the two lists noted above.
 
Wooden and aluminum metal/alloy bats are not subject to the moratorium. Bats that have only a metal or alloy barrel (and no other material, unless it is in the end cap of the bat), and if it meets the other standards (length, diameter, etc. for the respective division in which it is used) are not subject to the moratorium, regardless of the composition of the handle or the transition to the barrel.

For a complete list of bats that may be used this year (those which have been granted waiver status) please go to the LLI website here. 
 FoFF