[boost] Question about useful libraries

Hello all! I want to ask an important question to the leading developers of Boost. The fact that many programmers write to mailing list of Boost developers about their libraries. And they raised the questions about interest in their libraries and about inclusion their libraries in Boost. But very often proposed library (or library with similar functionality) already exists in Boost, or nobody is interested in a such library. Could you write about the subject areas and technical directions for libraries which would be *REALLY* useful in Boost today? Thanks. - Denis