According to both ipv4depletion.com and potaroo.net, the IANA is within days of allocating its last block of IPv4 addresses to the regional internet registries. In fact it might have already happened, though there has been no announcement of it yet.
This means the global pool of IPv4 addresses has been exhausted, and all remaining IPv4 addresses have been allocated to a particular region of the planet. The regional authorities will start to run out in 2011 and 2012.
IPv6. It's on.