This is a common question I get asked at many of my classes.

The short answer is that I really can't keep track of it all - I don't think anyone can.  But here is how I track what I can:

First - I often read the technical sections of the following news sites:

• cnn.com
• newyorktimes.com
• msnbc.com
• mercurynews.com

Second - I watch Internet videos using the following sites or by subscribing to their podcasts:

• wimp.com
• youtube.com
• viralvideochart.com
• geetbeat.tv
• webbeat.tv

Third - I use the following sites

• techcrunch.com
• tekzilla.com
• engadget.com
• mashable.com
• killerstartups.com
• techmeme.com
• geeksugar.com
• urlesque.com
• knowyourmeme.com
• whatthetrend.com
• google.com/trends

Hope that helps.