Hi Beman, all, Couple of comments after scanning the documentation. It does look like a solid library but the Hello World example in the documentation appears to be out of synch with the code, and with Boost. None of its includes are correct (except iostream). It looks like the operator<= overloading (?) is intended to invoke some binary stream functionality which isn't yet in Boost. Unfortunately I wasn't able to get it to compile because I couldn't find <boost/binary_stream.hpp> anywhere. There appears to be some related detail::binary_data stuff in endian/boost/io/detail/bin_manip.hpp but I couldn't figure out how to connect it. An unrelated comment: on the "conversion functions" page of the documentation, there are some references to "indicated byte ordering" - which confuses me because I don't see where the byte ordering is indicated. Does this mean the ordering which Endian uses internally? Cheers, Gordon