IDC and Gartner both released revised tablet projections in the past month. According to Gartner Apple will control 61.4% of the tablet market in 2012. IDC says Apple had a 68% share of the global tablet market in Q1 2012. Gartner is counting projected sales, while IDC is measuring shipments.
Shipments have been definitively shown to be an inaccurate metric in the past. Shipments do not equal sales.
Yet late last week ad network Chitika found, based on millions of impressions on its US-based network, "that the iPad accounted for 94.64% of all tablet based traffic." By contrast Chitika said that the nearest competitor, the Samsung Galaxy tablet, "boasts a lack luster market share of 1.22%."
The ad network found that for every 100 iPads there were just over 1 Samsung Galaxy Tabs, as measured by traffic generated. For every 100 iPads there were 0.8% Kindle Fires. As an aside Kindle Fire sales have dramatically slowed this past quarter.
While Chitika's network is not synonymous with the entire Internet it's going to be generally representative of traffic trends. In Q3 2011 comScore reported that "iPads delivered 97.2 percent of all tablet traffic in the US."
There's something really out of alignment between what IDC, Gartner, NPD and several others are reporting in terms of tablet market share and what's actually happening "on the ground" in terms of usage.