Interesting stuff... let me throw in another "currency" that we played with in the now-defunct Uplift Academy web site which we just moved into omidyar.net: the concept of an Aha!.

This is a lightbulb icon that a user can give to an object (person, web page, idea, etc) that triggered an Aha! reaction. This would allow folks to track other's epiphanies as they wandered through the space. John Graham came up with the idea in the first place, mentioning that it could lead to a Global Aha! as the network percolated enough personal ahas.

When I mention this idea to folks, they usually respond with an unconscious Aha!.

<signing off for the weekend>