Instructables - Instructables is an incredible site that lets you explore, document and share your creations.
Make: Projects - This is the projects section of the official website for Make Magazine.
PIE - The PIE Institute stands for Play, Invent, Explore. This Exploratorium web site is a great resource for project ideas.
Super Awesome Sylvia - Young Sylvia's DIY webshow on everything cool and worth making.
The Tinkering Studio - This site, hosted by the Exploratorium in San Francisco, is a great place to find project ideas.
Young Makers - Do you want to see what other people are making around the world? Check in on this site for more information.
Howtoons - Great starter projects can be found here.
Curiosity Machine - This is a nice site for all types of maker projects. A number of them relate to topics covered in this course.
Adafruit's Learning Center - In addition to being a great place to buy materials, Adafruit offers an extensive learning library covering a variety of projects.
HackNMod - The name says it all, amazingly cool hacks, mods and projects.
Soft Circuit Saturdays - Projects and tutorials on wearable technology are available here.
Element14 - Find projects as well as resources for learning more about Arduino, robotics, 3D printing and more.
Tronix Stuff - Organized mostly for Arduino, this site offers a number of different electronics projects.
DIY.org - A large variety of projects can be found here. Use the search button to find your area of interest. Earn badges along the way.
MakeUseOf - This site has a collection of Arduino projects to choose from.
Design Squad Nation - This site, hosted by PBS, has a tremendous amount of very unique projects, including both digital and real life projects.