On BBM, when a contact's avatar is dim, does that mean that the person deleted you from their contact list? Maybe that the PIN changed? No idea, but I've noticed that a few contacts' avatars are dim, and I was curious what that means.

it means the remote is off, out of service, no service or they don't like you anymore and did delete you. Before thinking the last, it's more than likely the BBM is off. It need to be running to be available.