As the client and the worker use it for document collaboration and communication the worker had been learning more about Google Wave. This came about just after writing "6 Tips for Using Google Wave on Your First Project." Since the initial post had been written, there have only been a better handle on the features, as well as on helping one to manage Waves and the related communications.
As client project would includes more than one document, using folders to better organize Waves is surely the best option.
Link: 4 More Tips for Using Google Wave on Your First Project