National discount retailer Dollar Tree recently launched an optimized mobile commerce site to enable shoppers to make purchases via their smartphones.

Mobile commerce is exploding due to the growing number of consumers who are turning to their smartphones to browse, research and purchase products. However, it is over the holidays when we see an extreme spike in activity on mobile devices as a result of last-minute shopping and traveling.

British retailers make up three of the four top-ranked m-commerce sites in Keynote System's latest Mobile Retail Index World Edition. All three are powered by mobile platform firm Usablenet.

Lacoste is letting fashion-savvy consumers browse and buy the season’s latest looks via a new mobile-optimized site.

M-commerce technology provider Usablenet Inc. is the power behind the throne of the top performers on this week’s Keynote Mobile Commerce Performance Index. Four of the top five retailers on the index—Dell Inc., Walgreen Co., CVS Caremark Corp. and Victoria’s Secret Direct—are Usablenet clients.