how it easily filters on "new updates" and "new responses" helping you focus your attention when you are ready for it.

the same way. Plurk is all "look at me!" But I get more value from FriendFeed, so don't make me choose.

i like the way it groups conversations

I like the way to groups conversations too, but it is not at all easy to skim, which is what I do on Twiiter.

I also wish I could edit or delete responses if I make a mistake.