This website is one method of connecting and collaborating.
If you need to refactor your code into a full featured telephony application, drop the jars into your lib-directory/classpath (available mid-late Jan 2010), implement the CSTAApplication interface - add three or four methods. The important two are handleCSTAevent() and post_init() to filter configuration.
Soon, you can connect to the hosted demo system! With a Handy CSTA Test Tool which will be used for tutorials and testing. Later in 2010 you can set your app to be load-tested!