We already have quite a lot on this at https://svn.boost.org/trac/boost/wiki/Guidelines/WarningsGuidelines (but more expert input/correction/improvement is very welcome. You can edit it, or I will handle the editorial bit if that is easier).
Not "expert" input, but the table under Specific Warnings and Suggested Actions :: Microsoft is barely readable for me (Firefox 3.6.8). Can't the columns in row i have the same width as the columns in row j for all i,j? On the issue of a casting between signed and unsigned types (error 4244 in VC), I am a bit concerned I am missing something. Why is there significant discussion about choosing which cast to make the warning go away? I am labouring under the impression that boost::numeric_cast was invented to do those conversions? Pete