Cloud service on the Raspberry Pi.

http://www.tech-fruits.com/archives/5455

[Linux] Create your own Cloud service #2.

http://sparkleshare.org/

Another post regarding Cloud service:

http://patrick-henriksson.blogspot.com/2011/09/linux-create-your-own-cloud-service.html

[Linux] Create your own Cloud service!

With ownCloud!

Features

Current
file management, WebDAV access, sharing, music streaming, users & groups, OpenID, LDAP, unhosted storage

In development
encryption, calendar, contacts, bookmarks, desktop sync client, Android & webOS apps, server-server sync

Planned
file editing, versioning & recovery, connecting to other services

Installation