Dividends offer _true_ returns:

They send a message to shareholders that you want them to stay as shareholders and are rewarding them for their committment to your company. Its a reminder to shareholders that the business investments you have made have actually worked and the reward is that cash can be returned to shareholders . That profits are more important to shareholders over the long term than trying to convince wall street to increase your PE [via buybacks].

Meanwhile... buybacks just perpetuate insider dilution:

Companies continuously issue new shares to their managers without asking their existing shareholders. Those managers then leak that stock to the market a little at a time. It’s unlimited dilution of existing shareholders’ stakes, death by a thousand dilutive cuts. If that isn’t a scam, I don’t know what is. Individual shareholders have nothing but the chance to sell it to the next sucker. A mutual fund buys one million shares of a company with your and your coworkers’ money. You own 1 percent of the company. Six weeks later you own less, and all that money went to insiders, not to the company. And no one asked your permission, and you didn’t know you got diluted or by how much till 90 days after the fact if that soon.

[1] http://blogmaverick.com/2006/07/22/executive-pay-and-stock-p...