eBay remains atop the list of sites attracting the most online shoppers, but Amazon cut the lead almost in half, according to NetRatings figures published in Internet Retailer. Wal-Mart also saw its traffic blow up, rising 42 percent, to land that brand in the number three slot, up from fifth place. Number one traffic generator eBay rose only two percent between 2003 and 2004, attracting 51 million unique visitors in the month of December. Amazon caught 43 million visitors, and Wal-Mart saw 24 million.