I am still trying to get my head around FriendFeed and with any social tool and always recommend listening before you jump in. This is a search from FF on The 100 Best Business Books of All Time:
http://friendfeed.com/search?q=%22100+best+business+books+of+all+time%22&embed=1 There are alot of people referencing the book with some mentions I have seen before in Twitter or through blogs, but many that are unique to FriendFeed. One interesting data source feeding into FF is Amazon’s Wish List. I am seeing alot of people adding The 100 Best to their lists.