a few non beneficial effects of technology

Is Technology Producing A Decline In Critical Thinking And Analysis
Article by a professor of psych at UCLA, analyzed of around 50 different studies.
Key points are that technology has its benefits, but isn't always the best method. Visual media doesn't allow for critical thinking and analysis in the way reading printed text (books) does.
Technology presents many distractions. A few of the studies that were brought up in the article

• students taught the same material with internet access and without internet access available to them. W/o internet retained more information when tested after the lecture
• students who watch the news without the scrolling text at the bottom w/ stocks, weather etc, (basically without multi-tasking) tend to retain more information from it.
  

Those are basically saying how technology can provide distractions in the classroom, as well as with retaining information.

It's not all negative though:
"New Zealand researcher Paul Kearney measured multi-tasking and found that people who played a realistic video game before engaging in a military computer simulation showed a significant improvement in their ability to multi-task, compared with people in a control group who did not play the video game. In the simulation, the player operates a weapons console, locates targets and reacts quickly to events."