This is the start page for the G20 Can Budget project, which will import the base G20 budget, and allow anyone to examine and expand on the budget details using a semantic wiki. Among the features are a data import of the original faxed budget overview, links to different entities and terms, and the ability to add and edit information, including discourse features to indicate position in the style of DiscourseDB.
Individuals can contribute by creating an account and adding or editing pages. You can create pages editable only by you under your own namespace (Your name/Page name), or download the complete data and site for your own uses.
More information here.