It does beg the question, what hardware would has the best cost/benefit ratio right now? Are low end GPUs best to mine with, or are racks of cheap power efficient CPU motherboards the flavour right now.
Where does mining stand right now WRT hardware, and given Monero's ASIC resistant hashing algorithm, where is it headed? Also as a bonus, how many pools are in operation, and is there a danger of centralisation like with Bitcoin?