Variable wettability of hybrid films of thin multiwalled carbon nanotubes and silane sols is achieved by the combination of transparent and conductive carbon nanotubes with the chemical functionality of the silane compound. These superhydrophobic or superhydrophilic films may be available for such applications as the development of self-cleaning coatings for optoelectronics. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2089/2008/adma200800239_s.html or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.