Building Stuff
Electronics
Adafruit
http://learn.adafruit.com/
Exploratorium
http://www.exploratorium.edu/explore/engineering-tinkering?page=1
Khan Academy-Discoveries and Projects
https://www.khanacademy.org/science/discoveries-projects
Instructables
http://www.instructables.com/
ITP Physical Computing
http://itp.nyu.edu/physcomp/
PBS Design Squad
http://pbskids.org/designsquad/
Sparkfun
https://learn.sparkfun.com/
Adafruit
http://learn.adafruit.com/
Exploratorium
http://www.exploratorium.edu/explore/engineering-tinkering?page=1
Khan Academy-Discoveries and Projects
https://www.khanacademy.org/science/discoveries-projects
Instructables
http://www.instructables.com/
ITP Physical Computing
http://itp.nyu.edu/physcomp/
PBS Design Squad
http://pbskids.org/designsquad/
Sparkfun
https://learn.sparkfun.com/