Apple CEO Steve Jobs is taking a leave of absence right when it seems his company needs him the most. Under Jobs, Apple invented the iPod and the iPhone. In recent years, sales of its computers have been growing by double digits and it has come to rival some of the biggest computer and cell phone makers around. But as the economy shrinks, and with parts of Apple’s product line in need of a refresh, it could use a little of Jobs’ magic touch. He is stepping down for health reasons (his poor health has been a subject of much concern among investors). The question now: can Apple still thrive without its leading visionary?