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.
The International Software Benchmarking Standards Group (www.isbsg.org) publishes benchmarks and a variety of related analysis reports.
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.
The Global Institute for IT Management (http://www.globaliim.com/) offers a variety of software engineering and management courses and a certificate in IT management.
Finally, no site is complete without a link to the Software Engineering Institute.