I love kinetic sculpture. Here’s a collection of my favorite work; Wikipedia has much more.

• MAKE filmed a wonderful artist profile on Reuben Margolin, who builds these floating wooden waves with an amazing sense of lightness. Watch full screen! 
  
• Hoberman Transformable Design creates expanding domes and architectural shells and originally turned me onto transformable (or deployable) structures. Here’s an interview.
• Daniel Piker’s Space Symmetry Structure blog covers, among various spatial curiosities, computer-simulated foldables and rigid origami. 
  
• The Hyposurface – a mesmerizing, undulating, triangulated wall
• Theo Jansen’s Strandbeests – creatures whose wind-powered frames majestically roam the beaches. His mechanics have inspired many others: e.g. cross it with a Segway for the creepy crawler, a car for the mondo spider, and the Arduino for this walker.
• Arthur Ganson – wires, cranks, walking chairs
• Tim Prentice – like blankets, wind, or wiggling microorganisms
• Ben Hopson studies movement in industrial design to give objects personality