Languageclass had a real bug leading to this new release just two days after 0.7.6.
0.7.7 2010-02-14 o new template classes Rcpp::unary_call and Rcpp::binary_call that facilitates using R language calls together with STL algorithms. o fixed a bug in Language constructors taking a string as their first argument. The created call was wrong.
As always, even fuller details are in the ChangeLog on the Rcpp page which also leads to the downloads, the browseable doxygen docs and zip files of doxygen output for the standard formats. Questions, comments etc should go to the rcpp-devel mailing list off the R-Forge page