Diigo ~ more than a research tool - a knowledge sharing community. Easy-to-use and so powerful... Check it out!
Social bookmarking with Diigo blends many web 2.0 powertools into on comprehensive program that 'lives in the cloud' making it accessible from any computer. It's a great way to manage and share information. This video tutorial will give you a solid conceptual overview of Diigo.
Via Dennis T OConnor, Howard Rheingold