I would suggest two pair of socks. I wear a minimum of three pair when I play soccer, and haven't had a blister since high school.
For blisters, the trainers at my college would fashion a piece of moleskin (or two pieces, depending on the size of the blister) with a hole cut out in the center for the blister to go. Seemed to help those dealing with blisters.
As far as the advice about not going barefoot, I'm not sure I agree. It may not help your current blister situation, but I would think it would toughen up your feet to help prevent blisters in the future. I could be completely wrong, of course.
Here's a link to a blog from a few years back that you might find interesting. The foot doc talks about moleskin -- doesn't mention cutting out the center for the blister, though (see 12/13th entry): http://drshoe.wordpress.com/2007/12/