Print on Demand (POD) simply means that a purchase of the book spurs the printing. It does not mean that it's a vanity or self-published book. Why people keep getting this confused is beyond me. It's very simple. On the other hand, so what if somebody self-publishes? It's not exactly the Crime of the Century. Nevertheless, here are a couple of sites that review POD books:
There are additional links from these sites.