en su libro “The Elements of user interface design”, Theo Mandel cuenta la siguiente anécdota para ilustrar una de las reglas de oro del diseño de interfaz, da el control a los usuarios:

“After designing a complex of buildings, an architect was supposed to design the walkways between the buildings. He did not assume that he knew how users would really use the walkways between the buildings. So he didn’t design the walkways or build them at the same time as the buildings. Rather, he had fields of grass planted between the buildings. It is rumored that even he posted signs saying, “Please walk on the grass.” A few months after the buildings were completed, he came back and saw where the most worn paths were where people walked across the grass between buildings. Then he knew where he should put the walkways.”

Una para saber el ránking de las páginas más enlazadas de del.icio.us (en las últimas horas, no las totales) y la segunda para saber qué tags le ha puesto la gente a una url.

Si te interesa el tema, hay una colección completa de utilidades en el blog Quick Online Tips That Work.