guile-lib is intended as an accumulation place for
pure-scheme Guile modules, allowing for people to cooperate
integrating their generic Guile modules into a coherent library.
Think "a down-scaled,
Also, it can be seen as a code staging area for Guile; the Guile developers could decide to integrate some of the code into guile-core. An example for a possible candidate is SRFI-35.
guile-lib 0.2.2 has been released. Check the NEWS for details.