Michelle Rawling from Oxford Journals has sent me an email clarifying my earlier characterization of the special issue of POQ as "free to AAPOR members. She writes:
"Public Opinion Quarterly has recently published its annual special issue, this time covering the topic of Web Survey Methods. As it has been in the past, the POQ special issue is free to all readers! For more information, including a complete list of articles and access to them, visit http://www.oxfordjournals.org/page/3534/3."
Thanks, Michelle, for the clarification.