A new alpha version of mcs::units has been posted to SourceForge since the vault is not accepting uploads: www.sourceforge.net/projects/mcs-units (mcs_units_v0.7.0_alpha_4.zip). This version includes some significant new functionality that Steven Watanabe and I have been working on: - heterogeneous and mixed unit systems allowing constructs such as watt hr, m^2/cm^(1/2), etc... in which fundamental units from different unit systems are combined and multiple fundamental units may have the same dimensional signature. - fine-grained implicit unit conversion has been enabled, allowing implicit conversions as long as they are allowed for every fundamental dimension present - conversions between homogeneous and heterogeneous unit systems - trigonometric functions and angle systems for degrees, gradians, and radians (with implicit conversions to SI and CGS radians) are included - a nearly complete set of CODATA physical constants Comments and bug reports (especially on the heterogeneous unit/implicit conversion functionality) are welcomed, as always. Documentation is not completely up to date, but virtually all functionality is demonstrated in the examples. Matthias