http://zqktlwk5ilgohy63eyrptyb4mc76bunfmxcnstkmveyjnskxkpq3b5yd.onion/wiki/Anonymous_Communications
However, a new, open zip format called 7-zip supports AES-256 encryption, and is probably more widely installed than GPG. For video content, both Google Video and YouTube are options. But again, use tor. The legal climate of the US is such that neither of these services are whistleblower-safe.