Some of these have a limit so if the link no longer works then the freebie is gone (I will try to keep up with the broken links). Here is a list of the ones I know about. Feel free to add your own freebies in the comments section:
Free Gardening How To Magazine (sign up for a free National Home Gardening club)
Free Issue of History Channel Magazine (when you sign up for the free membership)
Free sample of Quaker® Life Bar
Free sample of Maybelline® FitME Foundation
Free sample of Jergens® Overnight Repair
Free sample of Playtex® Sport
List of Free Samples (this will take you to an updated list of free samples)
Free Personal Finance Newsletter for Women
Choose Three Free Magazines (you can choose up to three and the ones they offer depends on the categories you choose for job and title. There are some good gardening ones in the agriculture category)
Free Sample Site (another site that keeps updated free sample lists for you)
Free Beautiful Alaska Travel Book
40 Free Prints from York Photo (sign up and put them in your account while the deal is still good)