In my sock weight sampler, I got Cash Sock MCN, Sheila's Sock and Silk Sock 50/50. This also came with two miniskein samples - Silk Sock 50/50 (unfortunately also in the sampler) and Sheila's Sparkle. I haven't tested them out yet, so I cannot review them... but I am saving them all for a special occasion.
The sock yarn sampler (and other samplers) are only available occasionally, so it is worth checking back on the website often if you are interested in trying them out for yourself.