On Thursday this week, 3-Feb-2011, the Internet officially ran out of IPv4 addresses that can be distributed. The last Three blocks were distributed that day and there are no more. It will be interesting to see how long it takes for everyone to start transitioning to IPv6 which has been up for some time but not widely adopted. See this Ars Technica article, River of IPv4 addresses officially runs dry.
The good thing about this is that we’ll finally have enough IP address space for everything, like toasters, refrigerators, and the stuff we can’t even dream about yet to have it’s own IP address.