New to LiveJournal?…

I was just going through LiveJournal and noticed a things which are new to me. I’m not sure if LiveJournal always had these and I didn’t notice… or if they are truly new.

Does Message Center track all comments that are posted on your entries, even older ones?… because it looks like I missed a whole bunch of old comments that I didn’t know about…

Also, does it keep track of replies to comments you make on other peoples posts?

I also noticed that my Instant Messaging client (Adium) has LiveJournal as one of the services (along with AIM, Yahoo, MSN, etc.). Is this the LJ Talk that I see in some user’s profile (xxxxx@livejournal.com)?… Does anyone IM using LJ Talk?

I also noticed that my user profile doesn’t have a LJ Talk listing. Is this feature only for paying users?

I feel like a LJ newbie… maybe I’ll search the help section…