April 6, 2009 - With over 100 million units sold since it was introduced in 2004, the Nintendo DS has become the highest selling handheld platform of its generation. With a veritable plethora of games marketed toward a broad cross-section of users both young and old, the Nintendo DS in undeniably appealing platform. But as is typically the case, only a portion of a console's success (or failure) can be attributed to software alone, and it is often carefully timed hardware revisions that can make or break a system, and in this regard, Nintendo has shown incredible aptitude. The platform has only existed in three principal hardware configurations – the original DS, the DS Lite, and now the DSi – with a number of special and limited edition aesthetic variations therein. While the original DS laid the groundwork for the handheld, it was the DS Lite that trimmed some of the device's fat and delivered a much-needed aesthetic upgrade. Now, with the DSi, Nintendo has tweaked the system once again with some stylistic and functional upgrades, but are they enough to garner your hard earned cash? We render our verdict below.