Apple's iPad rules tablet market, but Samsung's Galaxy Tab among other options

It's not quite accurate to say that only two categories of tablet exist - the iPad and Everything That's Not an iPad. But that description isn't far off.

Source: http://feeds.washingtonpost.com/click.phdo?i=58baaba5550bbf3a8753199c0b1db245

WESTERN DIGITAL VOLT INFORMATION SCIENCES VISHAY INTERTECHNOLOGY VIRGIN MEDIA VIEWSONIC VERISIGN VERIFONE HOLDINGS