links for 2008-06-21

• Introduction to Design Patterns in C++ with Qt 4
  (tags: c++ programming design book)
• Unit Conversion Online – Use Our Unique Conversion Tools Free
  (tags: converter conversion tools reference online calculator)
• The Best Developer Cheat Sheets Around | Webmasters by Design
  (tags: Cheatsheet programming Development reference design)
• PaycheckCity.com | Form W-4 Assistant
  (tags: taxes finance w4 jobs finances career calculator money)
• Oatmeal Box Pinhole Photography by Stew Woodruff – How to Make and Take Pictures With Pinhole Cameras Made from Oatmeal Boxes
  (tags: photography pinhole camera HowTo tutorial diy)
• Heathkit Educational Systems
  (tags: electronics heathkit education)
• Saving the World One Tennis Ball at a Time
  (tags: cool inventions)
• SensibleUnits.com
  (tags: reference measurement units converter tools)
• Welcome to the Electronics Club
  (tags: Electronics reference diy projects tutorial hardware)
• Image tools for your website : Magic Toolbox
  (tags: javascript ajax flash web2.0 lightbox development)