Dear PDF software developers,
Considering the ongoing PDFReaders campaign of the FSFE[1], we were wondering if you have noticed any change (increase?) in your website's visits, or the number of downloads of your software? We would be keen to know, so if you have the possibility, please consider giving us some feedback on this.
Sincerely, Nicolas
[1] http://www.fsfe.org/campaigns/pdfreaders/pdfreaders