According to the latest Symbian Community Newsletter, Nokia has begun shipping the 6680:
Nokia has started deliveries of the Nokia 6680, introduced just one month ago at the 3GSM World Congress in Cannes, France. The Nokia 6680 WCDMA/EDGE imaging phone features Symbian OS v8.0a and Series 60 Platform 2nd Edition, Feature Pack 2.
Be patient though. Just because they’re shipping doesn’t mean that you can walk in to a shop and pick one up. I’m definitely impressed by how quickly they went from announcement to ship on the 6680. If they easily make the April estimate on the 6680, things are looking good for say an early June release of the 6682 just in time for me to buy a new phone…