yourminis.com is a personalized dashboard of minis (mini applications, also known as widgets) that let you perform specific tasks, and get information and features from all over the web in one place.
Widgetbox is an online directory of web widgets for blogs and other web pages. We're in beta — try out our service and let us know where we need to improve!
T. Nelkner. Best Practices for the Knowledge Society. Knowledge, Learning, Development and Technology for All, Volume 49 von Communications in Computer and Information Science, Springer Berlin Heidelberg, (2009)