In July, we announced that a team of PIs, in collaboration with INRIA, had obtained funding from NSF to develop the next major version of ns-3: http://mailman.isi.edu/pipermail/ns-users/2006-July/056352.html
A small team of us has worked hard over the summer to establish some project infrastructure, initial designs, and initial code, and we'd like to announce its availability today at the following website: http://www.nsnam.org We will regularly maintain that website and the documentation contained therein. Please visit our website if you are interested in contributing or in tracking the project. We plan to hold technical discussions on the existing ns-developers mailing list. -Tom