Don Lehman's MORE/REAL Stylus Cap is a cool iPad stylus project looking for funding via Kickstarter. The idea is to create a cap with a conductive tip that will fit over a Sharpie, Bic, or Fineliner pen. Lehman's introductory video below shows the stylus cap at work.
Looks fantastic and simple, and you'll have one fewer thing to carry with you because it acts as pen and stylus. Sweet. You can help fund the project and reserve a cap by heading to the Kickstarter page.