Boost 1.39.0 beta 1 is available for download

Boost 1.39.0 beta 1 is available for download from SourceForge.

See 
http://sourceforge.net/project/showfiles.php?group_id=7586&package_id=8041&release_id=678473

New Libraries: Signals2.

Updated Libraries: Asio, Flyweight, Foreach, Hash, Interprocess, 
Intrusive, Program.Options, Proto, PtrContainer, Range, Unordered, 
Xpressive.

Updated Tools: Boostbook, Quickbook.

Plus the usual bug fixes to numerous libraries.

Please report any problems to the Boost users or developers mailing list.

Thanks,

--Beman Dawes, Daniel James, and all the other Boosters who help get 
releases out
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