In my previous post, about the process of upgrading to Office 2007, I mentioned that Outlook had asked at startup if I wanted my RSS feeds sync'd with the Windows Common Feed List. Given that I rely primarily on FeedDemon and NewsGator's products for RSS, I chose 'no' and moved on.
Later, I went looking around to experiment with the Common Feed List in Outlook 2007 and IE7... but couldn't find the option anywhere in Outlook to change my mind about that initial selection.
This evening, I finally came across the option and figured a follow-up would be a good idea here.
In Outlook, go to Tools->Options and select the Other tab. On the Other tab, click the "Advanced Options" button and you'll find a checkbox on the resulting window -- Sync RSS feeds to the Common Feed List.