Handy Office Developer Map
Just published to MSDN: a handy little WPF app that places in one place lots of the resources you need to know about for developing Office applications (which includes, in particular, MOSS).
If you have the .NET Framework 3.0 installed, then you can just get the 1.5Mb ClickOnce install here; otherwise, install the prerequisites and run the application from here. In either case it will subsequently be available from your Start Menu.
The MSDN Page with further info is here.