Five weeks ago, members-only home and décor retailer Fab.com launched mobile shopping apps for the iPhone, iPad and Android devices. It didn’t take long for mobile to become a hit.

Today, after that short period of time, more than 10% of Fab.com’s more than one million members are using the mobile apps on a regular basis, the merchant reports. The apps generate more than 15% of total Fab.com sales. And they account for more than 20% of sales through the retailer’s holiday gift shop. 10% of traffic being mobile is not unheard of in e-commerce; however, 15-20% of sales coming through mobile devices is remarkable.

By comparison, 14.3% of visits to the sites of e-retailer clients of IBM SmarterCommerce stemmed from mobile devices, and mobile shoppers accounted for 9.8% of total sales. These are among the highest figures for these metrics in mobile commerce to date.

“It’s already looking like a mobile holiday,” says Jason Goldberg, founder and CEO at Fab.com.

Additionally, the reviews are in on Fab.com’s apps. To date, 738 Fab.com app users have registered their opinions in Apple Inc.’s App Store in the Customer Ratings section. 600 rate the app five stars, 88 four stars, 16 three stars, 12 two stars and 22 one star.