Here's a list of what we've been able to find out about all independent-expenditure-only committees -- better known as Super PACs -- along with links to the FEC pages that document their activities to date. Our friends at the Center for Responsive Politics also have a resource for tracking spending by Super PACs, available here.
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And a list of most of them. So deficient is MSM reporting that I could not find texts of the Gingrich anti-Romney emails. I shall continue the search.