What a light tent does is help diffuse the light on an item, so that it's shining evenly instead of harshly on the item being photographed. This really helps the item look better and helps the colors appear more true in the photograph, both important factors when one is trying to present one's items for sale via an online photograph.
Some of the images on my site came out nice. Others need better lighting. Period. Well, now I'll be able to do that.