SVM Mac is the biggest and most important French Mac magazine, and Mailplane has been tested on page 92 in the current June issue (#206).
Best of all, Mailplane gets five mice - the max! According to the editors, Mailplane is "Indispensable" for Gmail Mac users. Plus: The magazine comes with a CD which contains Mailplane.
Without Michel Tribet's excellent French application translation, Mailplane wouldn't have appeared in SVN Mac... thanks Michel!