Also, to answer valterb's question, there is no trademark violation in this case. IANAL, but writing a book and calling it "A Guide to Using Product X" and "X" is a trademark is not something that the trademark owner can restrict. In the same way, we can say NeoOffice is based on OpenOffice.org even though OpenOffice.org is a trademark.
In other words, you can talk about someone's trademark and/or the thing that is trademarked. What you cannot do is release a thing a call it by the trademark name. The above examples in the first category, someone releasing their own NeoOffice release is in the second.
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