The iPad now accounts for nearly 1% of all Web browsing, which may not sound like a lot until you look at the numbers for Apple's closest competitors.

The iPad conducts 0.92% of Web browsing, but the Android-based Samsung Galaxy Tab clocks in at a meager 0.018%, the Motorola Xoom at 0.012%, and the BlackBerry Playbook at 0.003%.

"In other words, the iPad has 53 times the usage share of its nearest competitor," says Net Applications, which estimates browser and operating system usage by tracking a global network of more than 40,000 websites.

Overall, Apple's iOS - which is used on the iPad, iPhone and iPod Touch - accounts for 2.38% of all Web-connected devices, in third place behind Windows' 88.69% and Mac's 5.32%.

All Android devices combined, including tablets and phones, total 0.76%, which is less than Linux desktops and the Java ME platform for mobile devices and embedded systems.

No one set of numbers can be seen as definitive, of course. Recent sales show Android phones matching or surpassing the iPhone. And StatCounter, another tracking organization, shows a relatively small gap between iOS and Android usage. In May, iOS accounted for 22.09% of mobile operating system usage, compared to Android's 17.63%, according to Statcounter. Both were behind Symbian's 31.36%.

Net Applications' latest market share report also shows desktop browser trends. Microsoft's Internet Explorer continued its slide, dropping from 55.11% usage in April to 54.27% in May. Firefox improved slightly from 21.63% to 21.71%, and Google's Chrome jumped from 11.94% to 12.52%. Safari and Opera account for less than 10% of Web browsing usage combined.