Why be content with a liquid highlighter pen when somebody can come along and invent one that is dry even when you first apply it?

FORBES: Magazine Article

It included a copy of the book, of course, but also a few superuseless promotional items, including a black highlighter pen, and this version of the Superuseless Superpowers e-book.

FORBES: Superuseless Superpowers

MotionTools and the Air Mouse app enable a presenter to turn their computer's cursor into a highlighter, laser pointer or pen.

ENGADGET: Movea turns your iPod touch or iPhone into an Air Mouse for just $2