The eBay Unsold Items page indicates the items that didn't sell. (Go figure.) To get to that area, you can scroll way down the page or click the Unsold link under All Selling in the My eBay Views box (on the left side of the page).

The drop-down list beside each item allows you to relist (so that you can get a listing credit for the first run of the item if it sells the second time) or sell similar (if the item hasn't sold after two listings, start the cycle in eBay's computer fresh as new).

When an item is relisted, a check mark appears next to the Relist link and the circular arrow goes from dimmed to solid.