In the spirit of this post by Paul from a few years back, just a note that the 2007 version of the IAEA/OECD Red Book is out. An OECD/NEA press release notes that the 2007 Red Book

estimates the identified amount of conventional uranium resources which can be mined for less than USD 130/kg to be about 5.5 million tonnes, up from the 4.7 million tonnes reported in 2005. Undiscovered resources, i.e. uranium deposits that can be expected to be found based on the geological characteristics of already discovered resources, have also risen to 10.5 million tonnes. This is an increase of 0.5 million tonnes compared to the previous edition of the report. The increases are due to both new discoveries and re-evaluations of known resources, encouraged by higher prices.

You can (and should) spend the weekend reading the whole thing HERE.