Boost release 1.55.0 beta 1 is now available from SourceForge

See http://sourceforge.net/projects/boost/files/boost/1.55.0.beta.1/

This release contains 1 new library:

        * Predef:   This library defines a set of compiler, architecture, operating system, library, and other version numbers from the information it can gather of C, C++, Objective C, and Objective C++ predefined macros or those defined in generally available headers, from Rene Rivera.

For details of what's in the release, see http://www.boost.org/users/history/version_1_55_0.html.
Note that the links to files on this web page are for the final release - use the SourceForge link above to get the beta files.

Please download the beta, give it a try, and report any problems you encounter.

Thanks,

-- The Boost Release Team