Online retail sales growth got off to a slow start in 2005, managing a relatively anemic nine percent boost over the same week in 2004, according to an Internet Retailer report on comScore figures. Retail spending online amounted to $1.2 billion for the week ending January 2. In contract, offline shopping showed enormous growth, hiking 55.6 percent, according to ShopperTrak. This year, that week included the day after Christmas, typically a major returns-related shopping holiday. Online travel grew 36 percent to $685 million.