SugarSync is a fairly robust piece of software which gives you remote file access and editing, on-demand synchronization, shared folders and improved camera features.
Starting today, SugarSync accounts will have improved folder sharing capabilities, allowing users to collaborate with anyone in their Gmail, Hotmail, AOL or Yahoo Mail contact lists. Users can also directly upload photos stored in SugarSync to Facebook, providing a streamlined way to share photos with Facebook friends while also securely storing them in their SugarSync accounts.
Under the new referral program, users can get up to 10 GB free for each person they refer to sign up for a SugarSync account. To refer someone, you can share a SugarSync folder with them, or send them an invitation through Facebook or Twitter.