The Official eBay app just got an update but listed as a separate app rather than the update in the Windows Phone marketplace. The new v1.13 brings in new start page UI and with support for Windows Phone Mango. It supports fast app switching, multiple live tiles – you can now pin individual searches to start screen and live barcode reader. WPCentral did a video walk through of the new app which you can watch above.
The app is free and you can download it here from the Windows Phone marketplace.