For those interested in the various classes/sessions, those for 2008, 2010, and 2012 are available on CD, while many of the older ones are available on cassette; click on the particular conference date to see the topics.
PFO also has many books, videos and tracts available for sale.
For me, one of their very best resources is their Quarterly Journal. I discovered PFO in late 1999 (too late to get time off from work for their 2000 conference) while researching Bill Gothard, and they provided me with some material, including a Journal. I found the Journal to be very interesting, and so began ordering back issues; the more I bought, the more I wanted until I owned all of them, and then subscribed from then on. I think they have one of the best apologetics journals available, and I highly recommend it.
When PFO began producing a CD with all of the back issues of their Journal, I acquired one. I found it very useful for cutting and pasting for citing in articles or letters/e-mails I wrote. Unfortunately for that use, as they improved the CD format it became pdf and unable to cut and past from (at least from my limited computer understanding). But having them quickly available on my computer has been a bonus, and sometimes when I get emails requesting specific informational help, I have sent a pdf issue of the Journal via email, always recommending the recipient purchase a subscription.
“What You Need To Know About Homosexuality” by Ron Rhodes, a teaching given at the 2010 conference, and provided to me with my latest Quarterly Journal. Since I purchased the entire set at the 2010 conference, this CD is extra to me.