Sebastian Hammer writes: "There is a new release of the YAZ [1] toolkit available (in addition to maintenance releases of ZAP and Zebra). The most important change is that we include support for an early version of the ZOOM API [2]. ZOOM is an exciting new development in Z39.50, which suggests a common, high-level interface which can be implemented across many toolkits, and in most programming languages. It promises to make life a lot easier for developers of Z39.50 clients."
Links:
[1] http://www.indexdata.dk/yaz/
[2] http://zoom.z3950.org/