Apple Computer v. Microsoft. As for reproducing screenshots, at least one court has labeled it as fair use (in a comparative advertising setting). Considering the thousands of how-to websites, do-it-yourself videos, and published computer guides that make use of similar screenshots and icons, we'd say you'll be fine. (From a practical perspective it also doesn't make sense for these companies to chase down people whose guidebooks encourage the use of their products.) Our only caveat would be to avoid uses of screen shots strictly for commercial purposes instead of commentary, for example copying screen shots of copyrighted sheet music. Prominent disclaimers -- "Not affiliated with or endorsed by Adobe" -- may help prevent any trademark claims by dissuading readers from believing you are connected with these companies.