Weave is web-based analysis and visualization environment. Per the Weave website:
Weave (BETA 1.0) is a new web-based visualization platform designed to enable visualization of any available data by anyone for any purpose. Weave is an application development platform supporting multiple levels of user proficiency – novice to advanced – as well as the ability to integrate, disseminate and visualize data at “nested” levels of geography.
There are three getting starting videos which gives you an idea as to how to use this visualization environment.