Outlook 2007 with Business Contact Manager
I missed noticing that the BCM team has created a new blog, but it's never too late to rectify a missing link. In this case I'm only a few weeks behind. The team behind Business Contact Manager, a very useful feature of Outlook provided in some versions of Office, has created their own MSDN blog.
So far there aren't a lot of posts, but I expect that to change as they grow the blog. They already have some frequently asked questions about BCM, and some links to how Outlook developers can extend Business Contact Manager and integrate a solution into the functionality provided by BCM.
If you're interested in CRM-style functionality in Outlook, you should definitely take a look at Outlook with Business Contact Manager.