Does the bulk import send everyone a resubscribe message? I've got a very small list (sub 100 people) of customers and prospects that I meet with IRL, and I don't want to annoy them by asking them to subscribe again to a list they've already subscribed to.
No, bulk importing does not send a resubscribe message. MailChimp assumes that if you have access to the address list, then you have permission to send.
So download your aweber list csv and then just upload it to mailchimp.
The only problem is that autoresponders don't seem to work for old users unless you do a dirty hack