GizmoWatch: When it comes to portable devices, smartphones hint at a hard fought struggle between a few electronic giants, who slog it out in the market realm. But when we consider tablets, they incredibly insinuate a nigh perpetual, one-way commercial sweep by Apple. Core statistics certainly attest to this, with the celebrated iPad line conquering around 90 percent of tablet market share, with a whopping $9.5 billion in revenue generation. In view of such amazing figures, do other tablet makers stand a chance against Apple's deftly fueled onslaught? We would not like to think so as a tad bit competition always brings out the best in commercial scheme of things. So, without further ado, let us check out some tablets from this year that have the potential to challenge the iPad.