We have used ShipWorks for over a decade now and could not imagine life without it. ShipWorks simplifies aggregating orders from multiple selling channels (Amazon, eBay, Miva Merchant, Shopify, etc..) and handling the entire shipping process for all orders. It also uploads the required shipping information and order status to each selling channel.
Also has remote accessing capability that connects remote users to connect and connect to the main working database. This is very useful for customer service and accessing order info for all orders.
When I first started HotSnapZ.com we were cutting and pasting address fields, amazing how far since then.
ShipWorks' Customer service is great and I cannot stress how much this program will improve your business Mojo if you are on multiple selling platforms. Try it out.....