With 2011 touted as the year of the tablet, the tablet war begins this week with Apple unveiling its new iPad Wednesday and BlackBerry-maker Research In Motion (RIM) following soon with its PlayBook.

Extending its tradition of updating its products every year, Apple is all set to unveil the iPad2 at an event in San Francisco. In fact, the new tablet comes less than a year after its money-spinning iPad which has sold more than 15 million units so far and accounts for 15 percent of the revenue of the world's most valuable technology company.