I frequent:   
Google Finance 
Columbus Racing 
Facebook 
Instructables 
Gmail//AIM 
Weather.com 
Miata.net 
Ted.com 
Porn   
When I'm really burning time, I research solar energy, hydrogen conversion processes, solar cell manufacturing etc.     
On a side note, I'm surprised by how much private interest exists for alternative energy and how many other people are dabbling in it by researching, writing, and making small experiments.