I would like to suggest that Logos adds Historische Grammatik der hebraischen Sprache des Alten Testamentes by Hans Bauer and Pontus Leander. I honestly wish it was in English, too. But, I will just have to learn German. It is a recommended Hebrew grammar for anyone who wants to become an advanced Hebrew student. I know scholars would be interested in this book.
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cross-posted to http://community.logos.com/forums/t/81824.aspx to bring it to the attention of the German language product manager - seems to be a real nice addition to Logos' offering, thanks Caleb for suggesting!