The best companies to work for are also apparently the best companies to invest in. Fortune magazine just released its annual list of the 100 best companies to work for, a listicle orgy of companies that offer jobs with amazing pay, perks, benefits -- and shareholder returns. The magazine noted that, since 1998, the companies on the list have outperformed the S&P 500 stock index by a ratio of almost two to one, according to data from the Russell Investment Group. The underlying message: Treat your workers well and the profits will follow.