I agree with Mark here. The lifestream space is in its infancy right now, and there isn't a particular app that enjoys mass adoption or a feature set that defines itself from the crowd. So, calling all future lifestreaming apps FriendFeed clones is a little misleading.
You wouldn't really call Facebook a Myspace-clone. It's because Myspace and Facebook (though having similar features) are two different apps solving different needs for different consumers.