Hi there, just a short note to say that there seem to be two changes that to me appear to be important enough to be documented in the changes section of 1.47: - In Boost.Random: There seems to be a new requirement for a static std::size_t URNG::precision() function in uniform random number generators. Since I roll my own, I ran into the missing function when trying out the Beta 1 of 1.47 - In Boost.Serialization: A very annoying bug seems to have been fixed: https://svn.boost.org/trac/boost/ticket/4842 . This one prevented me from recommending any Boost version newer than 1.43 to our users, so it is pretty important for me that it has been fixed. Otherwise 1.47 beta 1 looks fine to me (Ubuntu 11.04 64 bit, g++ 4.5.2 . Best Regards, Ruediger