Kevin writes: "There is a new release of the YAZ toolkit [1]. YAZ is a C/C++ programmer's toolkit supporting the development of Z39.50v3 clients and servers. In the new release, there is a new client-side MARC decode/display function which properly rejects non-ISO2709 records. There are also some ZOOM API changes."
Links:
[1] http://www.indexdata.dk/yaz/