CARE has a long hisotry of tracking the unfulfilled promises of technology in education. Here's a link to an article (from 2000) that suggests some reasons for this, as well as some solutions.

Tech & Revolution in Education - Ending Cycle of Failure - Ehrmann Trite statements often become trite because they are true. For example, "digital technology can enable a revolution in education." True. Every five or ten years, when a major new computer chip, visual medium or telecommunications channel comes along, the trumpet is sounded: The revolution is about to happen.

But the revolution doesn't happen. By the time another major new technology appears a few years later the earlier predictions have been forgotten or shrugged off. If anyone wonders what went wrong, they are told that the old technology was obviously too slow or primitive. This cycle of failure has been repeated many times: mainframe computers, personal computers, videodiscs, graphical user interfaces, HyperCard, E-mail, CD-ROMs, Gopher, the Web.