"The landscape of social bookmarking tools is like the wild west." Users who would like to make the right choices should consult bookmark comparisons before they invest their resources into one or a couple of options. "ConsultantCommons provides an online collaboration space and community for non-profit technical assistance providers to collaboratively build and share knowledge." Their article (print version) investigates the functionalities and examples of usage of the ever evolving bookmarking systems.Their primary selection criteria is, that the service should be compatible with nonprofit communities of practice.The commentries add further more services. One noteworthy one is a matrix (pdf) by Thorsten Rox comparing 11 major providers in July 2005.

(via Kairosnews)