SugarSync

SugarSync is the world's simplest online backup with remote access, multi computer synchronization and online sharing built in.

• Back up all of your Macs and PCs into a secure personal website that you can access from any computer and your mobile phone
• Keep folders automatically and constantly in sync across Macs, PCs and your personal website
• Access, view and share your files 24/7 from your mobile phone, even when your computers are turned off
• Send any size file no matter how large - from your desktop, the Web or your phone

See here for pricing details.

• We've added the ability to delete items from the SugarSync desktop app so you can better organize and manage your files.
• You now have an even more complete file manager with the ability to rename sub-folders/files, in SugarSync.
• The Mac task bar bird menu icon color can be customized to your preference.
• You can easily empty all deleted items to free up storage space on SugarSync. Simply click on the "Empty all" to clear out all deleted items.
• Move feature is enhanced with device name information so you can identify top level folders having the same names.
• improved accessibility to Files Transfer view so you can track and prioritize files being transferred.
• added support for OS X 10.6.
• Bug fixes