retroshare 0.2.1 RC4

retroshare provides a private P2P file sharing software.
Retroshare is a cross-platform private P2P sharing program. It lets you share securely to your friends, using a web-of-trust to authenticate peers and OpenSSL to encrypt all communication. RetroShare provides filesharing, chat, messages, and channels.
Main features:
- A Private Peer to Peer Network which allows you to share information with only the people you want to.
- Reliable Identification and Authentication of your friends.
- Plus an Introduction Scheme which connects you to the friends of your friends, and facilitates network growth.
- Encrypted Communication, ensuring all shared information is known only to you and your peers.
- A Communication Platform which can potentially support services such as Secure Email, File Sharing, Video or Voice over IP and Messaging
- A Decentralised Social Sharing Network designed **For the People**
- with no dependancies on any corporate system or central servers.
Enhancements:
- First release with Web of Trust Authentication!
- Downloads are automatically resumed
- New Directory search interface.