iPad users account for 90% of US mobile commerce revenue

"New data from The 2012 Q1 Shopping Insights Mobile Study shows that:
IPad users now account for about two-thirds (68 percent) of mobile shoppers.
The iPad drives an enormous 90 percent of all mobile revenue (and 4 percent of total retail revenue).
Conversion rates were strongest with the iPad (1.5 percent for iPad vs. 0.57 percent for other mobile devices).
Compared with all other mobile devices, average pages per session were highest for the iPad, at nearly six pages per session (5.7 for iPads vs. 3.6 for iPhone vs. 4.1 for other mobile devices).
The iPad had the highest average order value (AOV) of any mobile device: $158 for iPad vs. $105 for other mobile devices vs. $104 for iPhone and other iOS devices in March 2012.
Interestingly, AOV for iPad shopping is even creeping ahead of the AOV from desktop computers ($158 for iPad vs. $153 from desktops)."

Source:  The Rich Relevance Q1 Mobile Shopping Survey, reported by Clickz, 25th June 2012