Why not start writing a few articles for IBM developerWorks. At the very least it will connect you to some good editors and give you credibility for the longer book. Potentially IBM will even pay you to write the book and publish it under their press.
To your specific question the vendor's EULA may have language that puts in restrictions (e.g. most restrict benchmarks). So, give the EULA a close read to get a sense. Second issue that you will have to pay attention to is trademarks, you'll need to seek some guidance so as to not put you on the wrong side of trademark law.
To your specific question the vendor's EULA may have language that puts in restrictions (e.g. most restrict benchmarks). So, give the EULA a close read to get a sense. Second issue that you will have to pay attention to is trademarks, you'll need to seek some guidance so as to not put you on the wrong side of trademark law.