Via Erika Ehrli's post I just discovered the newly released Microsoft Office Interactive Developer Map. It's a slick Windows application built on WPF. For each of the different feature areas in the Office client and server products, it gives you an aggregated view of the latest news, available reference documentation, community resources and much more.
Every time you launch the program, it checks for updates and pulls them from the server when available. I'll probably still use search and my blogroll as my primary sources of information, but when needing to get quickly up to speed on a feature area, I think this tool will come in handy.