Avoid Big Brother: File Sharing Anonymously

Did U.S. authorities overstep their jurisdiction when they pulled the plug on cyberlocker service Megaupload? Of course. Don't they always? But it appears that the Fed's takedown of Megaupload - note, without SOPA, PIPA, ACTA, or any other special legislation - has only encouraged more sophisticated methods of file-sharing/storing, free from the prying eyes of governments, corporations and advertisers. 

Thwarting the state:

RetroShare is a Open Source cross-platform, private and secure decentralised communication platform.
It lets you to securely chat and share files with your friends and family, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication.

HFS HTTP File Server

... it's file sharing... it's webserver... it's open source... it's free... it's guaranteed to contain no malware

DiskCryptor

PeeJe -Share is an absolutely free file-hosting service for providing webspace on our servers without the need to sign-up.

Links:

Cloud computing is a trap, warns GNU founder Richard Stallman

Control Your Computing Before It Controls You