While google wave may be the future of communication, it's certainly not there yet. This wave robot allows you to register to get emails whenever a wave changes (or to get hourly, daily, or weekly digests). Now you can know when an important wave changes.
in the future it will also provide RSS feeds for changes on a waves as well as providing webhooks to allow developers to perform their own operations when a wave changes.
Add it to your wave: wavedigest@appspot.com
check out the code and let me know what you think. if you have wave access and have developed some robots and want to contibute shoot me a message.
http://code.google.com/p/wavedigest/