A federal disclosure law requires section 527 political organizations to file with the IRS "an initial notice of their existence, periodic reports on their contributors and expenditures, and an annual return, and requires the organization and the IRS to disclose these documents to the public." The initial notification forms from the organizations, which include a (usually terse) statement of purpose, have been placed online at the above site. Contact information (including email for many) for the often mysterious 527 organizations is also listed. Presumably, when reports and returns are received, they will also be placed on the site, making it a valuable tool for journalists and others interested in public disclosure.