Chris Anderson writes: "I've argued, again and again, that successful Long Tail aggregators have to have both a head (hits) and a tail (niches) to work well. It's not enough to just have the tail. People need to start with what they already know and then discover, via effective recommendations and other filters, niches that suit them better. ¶ But Adina Levin of BookBlog says I'm partly wrong. And, alarmingly, I find myself agreeing with her. ..." Link: The Long Tail weblog.