There are a few places online that will let you do just that. All it takes is you providing a bit of information on the condition of what you want to get rid of. They then give you a figure for which they will buy the item from you for. If you are happy with what they are offering, you ship it to them and get paid after they have received and inspected the item.
SecondRotation accepts a range of gadgets from cell phones to GPS devices. Finding the gadget you want to sell is relatively easy as they have graphical representations of all the items they buy. After you have gone through providing them with the details on the condition of your gadget and have accepted their trade in offer you are taken through to a screen where you provide them with your details and how you would like your payment to be sent to you (by cheque or PayPal). The last step is organizing shipment of the item(s) to them. What I like about them is that it’s free to ship your item(s) to them. All you need to do is pack it up, give DHL a call and they will come and pick it up. It couldn’t be any easier.
Another option that you could take a look at and compare to SecondRotation is BuyMyTronics. They work pretty much along the same lines as SecondRotation. At present they are only accepting iPods, iPhones, Zunes and game consoles. They are working on accepting other electronic devices. A point of difference between the two is that BuyMyTronics does not offer a free shipping option and you have to ship the item to them at your expense.
Both sites offer pretty good services and it would pay to compare the trade in values that they will offer to see where you would get the best deal. I put in information for a 6GB Apple iPod mini in an excellent working condition. BuyMyTronics valued it at $44.08 and SecondRotation $39.00. Where would you trade-in the iPod?