Stylus pens are becoming a fairly common category, but not so much yet with pencils. We've found a few, though, giving some interesting options for those who poke paper with pencil and prod iPad pixels too.
A pencil can be the perfect tool for thinking and rough sketching - scribbling down ideas, and getting rough designs down - just the sort of things you're likely to want to do on paper, even if you use an iPad for most other things. The simplicity of a pencil is perhaps the perfect sidekick to the power and complexity of a tablet or a phone.