WonderLister Online – a premier eBay listing management software offers some unique advantages that you don’t get directly from eBay itself. eBay keeps your listings and sales data and your pictures for a limited period of time. Thus, if you happen to use other applications where such data might be needed, you are out of luck here. However, on WonderLister, all your data is kept forever. Therefore, you decide how long you need to keep it. WonderLister also provides the flexibility to export the data in flat files which you can import to other applications.