I would be nice to have the large image popup also include the additional images in thumbnails so you could browse all the available images at one time.
Examples can be found at
[url]http://www.frontgate.com/jump.jsp?item=UM6091DS&maincatcode=1&subcatcode=null&itemID=1781&itemType=PRODUCT&path=1%2C2%2C145%2C728%2C732&iProductID=1781[/url]
I like their Zoom feature as well.