I totally thought I would have buyers remorse by now, but no. This is by far the best phone I've ever used. I was looking hard at a treo, but I really wanted something that would play nice with my mac. Trust me, you'll love it!
I personlly love iChat, but looking at my buddy list, there's only three other people using iChat right now, the rest are on AIM. And like otheres have mentioned, not everyone uses AIM. So, I'm forced to use Adium to chat with those not on AIM, but honeslty I preferr iChat's interface.
Video chat is great, but I find once you add more than one person to the conference, the quality suffers greatly! The Molehill team has tried to do a 4-person conference, only to find that we're looking at blurry static pictures of each other.