Simplenote (in conjunction with Notational Velocity and ResophNotes), OneNote, Tomboy, Zim, Springpad... they've all left me feeling a little meh.

ENGADGET: IRL: Evernote, Netgear N900 and FiiO's E17 headphone amplifier

With our pitched instrument selected, the grid on Push changes from the step-sequencer view into its method of notational input.

ENGADGET: Ableton Push review: a dedicated controller for the Live faithful

But beyond the trading of energy futures contracts back and forth--all with huge notational values--Enron's sales grew because it was a "market maker, " serving as the middleman on deals.

FORBES: Enron The Incredible

And of all the artifacts that have aided cognition, the most important is the development of writing, or more properly, of notational systems: number systems, writing, calendars, notational systems for mathematics, engineering, music and dance.

FORBES: Magazine Article

So, good list, Forbes, but you left out the most important tools of all, the cognitive artifacts that have truly made us smart: writing and notational systems, objects of travel and information technology, which really picked up somewhere around the development of the telegraph, but could be argued to have developed earlier with the wide variety of signaling systems.

FORBES: Magazine Article