Google wave is not really that complex, first thing to do before using it is to watch the video demo (I'm almost sure very few peoples did it), it's a collaboration and productivity tool, so you just can't invite your friends to use it at this stage, you can invite your colleagues and employess, but it's not a product targeting any casual Joe friend, but google seems to expect peoples to adopt it as such. You probably won't ask your friends to use a task management tool to keep in touch with you or what you do. I'm glad it may stick around for sometime,I hope forever, too bad, they will no more work on it.