http://www.puzzles.com/ Logic puzzles
3D Cube Puzzle Build the figure with the limited number of cubes to solve the puzzle.
Traffic Jam - Use problem solving to get the red car out of the jam.
http://www.bloxorzgame.com/ - Rotate a rectangular prism until it drops down a hole.
http://www.lumosity.com/ - Improve the health and function of your brain with these workouts. You will need to create an account.
http://coolmath-games.com/1-logic-games-01.html - Some of these games are designed for elementary students, be sure to choose age appropriate games.
freeonlinepuzzles.com and http://freejigsawpuzzles.com/- Put together puzzles online.
mathartfun.com - math resources store
crazyimages.com - interactive fractal images
http://www.mathsnet.net/geometry/solid/houses.html - this is the site with cube building
Interesting site: www.Ted.com Be sure to check out the origami lecture.
Free online courses and video lectures: http://academicearth.org/ and http://ocw.mit.edu/index.htm