Yep, you're totally right!
You really can't see much in the screen shot on the website, but from what I can see, the online address book looks like it'll be pretty good!
edit:
Hmmm... I was just thinking. I wonder why they've decided to wait until MacWorld to make the address book available? I wonder if there are more .Mac additions that will be announced on the 7th that will tie in with the address book?
From all accounts, this MacWorld looks like it's going to be a really good one! (granted, they always seem that way beforehand...)