Here is the list of topics that appear on their help page.
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Getting Started with Google Wave
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Your Account
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Your Waves
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Troubleshooting
Guess that pretty much cowers all that you might need to know about Google Wave. There is also a section with related articles submitted by users. This section is very interesting because you get to read live feedback and thoughts by Wave users. Many doubts are expressed and cleared and I am sure this helps in better understanding of this program. It definitely needs some time getting used to and for those who want to read more before riding the wave. I hope this post Helps