Google Wave Manual

A Guide to Google Wave is available online for new comers and users trying to expertise the technique of waving. It covers a comprehensive list of Google Wave features, Getting started, How To, Managing contacts, Organizing waves, Wave Gadgets/Extensions etc. Book content contains 8 Chapters namely

1. Meet Google Wave
2. Get started with Wave
3. Manage your wave contacts
4. Find and Organize Waves
5. Dive Deeper into wave
6. Master Wave's interface
7. Wave Gadgets
8. Wave Bots

However this isn't the Official release from Google Inc., but perhaps we may see an Official update from Google on Google Wave Guide from Developers perspective.

Google Wave Guide