The DOD maintain an excellent site for those interested in the topic of Acquisition Reform.
The Defense System Management College has many useful publications on Acquisition Management.
The Data & Analysis Center for Software (DACS) has lots of useful information on software topics.
USC maintains the main page for COCOMO II on the web.
Dan Ligett sells a popular version of the COCOMO II package called COSTAR.
Of course, IFPUG is the place to go for function point information.
Finally, no site is complete without a link to the Software Engineering Institute.