I've been in some pretty fun campaigns for Smiley360. They seem to offer mostly home and health items. The campaigns are easy and they usually send you a full sized product.
Pinchme used to be a great sample sight until it became popular. If you have been with them for a long time you will not get samples. The few (if any) that appear for you to take will be "sold out" the second they become available. It is a waste of time and their claim that samples are now easier than ever to get is false. I'm only giving it two stars because it used to be so good.