For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Plupload - Multiple file upload utility using Flash, Silverlight, Google Gears, HTML5 or BrowserPlus!
Dropbox - Online Sync and File Sharing
FancyUpload - digitarald:Harald K - Consultant & Contractor - FancyUpload - Swiff meets Ajax - Swiff meets Ajax for powerful and elegant uploads.
Google Drive - Access and sync your files anywhere
SmartFile - Secure file sharing & FTP hosting for the enterprise.
Mega - Secure File Storage and collaboration