ARS technica takes on the IPv4 addressing market with two opposing articles in support and against IPv4 trading.

Iljitsch van Beijnum:

http://arstechnica.com/tech-policy/news/2011/08/trading-ipv4-addresses-will-end-in-tears.ars

Timothy B. Lee:

http://arstechnica.com/tech-policy/news/2011/08/the-case-for-a-free-market-in-ipv4-addresses.ars