Correspondence Between the NSA and Google Leaked
Al Jazeera is reporting on leaked emails (not leaked by Snowden, but by someone else) detailing close ties between the NSA and Google. There are no smoking guns in the correspondence — and the Al Jazeera article makes more of the e-mails than I think is there — but it does show a closer relationship than either side has admitted to before.
EDITED TO ADD (5/7): The correspondence was not leaked. It was obtained via a FOIA request.