Two reasons stand out: iPod and iPhone, and the ecosystem supporting them. Apple launched its tablet with huge manufacturing, distribution, and third-party support, something it didn’t have with iPod and less of with iPhone. Purely from that perspective, and discounting design or technical merits, Research in Motion and Samsung are strategically in best competitive ecosystem positions to release viable iPad competitors. But will they?

Some Apple fans will disagree, arguing that iPad’s size, design, and user experience make it far superior to other tablets. I won’t debate those points here but only observe they would be meaningless without the supporting ecosystem created by iPod and iPhone. Apple didn’t launch iPad into a vacuum but with lush sales and distribution environment.