DropBoks offers free online storage, just like an online "drop box." You get 1 GB free, but the real beauty is the clean and simple interface that anyone can understand.

Box.net is a web-based service for content management, file sharing and collaboration aimed at the SMB and enterprise market.

Zumodrive stores your data in the cloud and allows easy access to all of your files from any device. The product streams most files as if they were on a local drive.
For your most popular files Zumodrive stores them locally for offline use. The produce is aimed specifically at notebooks and mobile devices with smaller hard drives.

MyBloop is an unlimited free file storage website. We give anyone the ability to upload all their files and share them with anyone else for free. You can upload files directly from the website or you can install the BloopLoader application to upload files by dragging and drop from your desktop. The BloopLoader is available for Windows and Mac (Intel-based PC.)

Drop.io is an online file hosting and sharing service that is designed to be simple and emphasizes privacy. It allows users to create online sharing points called “drops” that are used for uploading and sharing documents, images, video, audio, and other digital content without accounts, registration or e-mail addresses. Drops are non-searchable and not networked.

Windows Live Sync (formerly known as Windows Live FolderShare) is a free-to-use application by Microsoft that is designed to allow files and folders between two or more computers be in sync with each other on Windows (XP and later) and Mac OS X based computers, similar to Live Mesh’s data synchronization services.
A maximum of 20 folders (or “libraries”) may by synced, including libraries shared over the internet. Each library can contain a maximum of 20,000 files and each file cannot exceed 4GB.

Box.net is an online file system that allows users to store, access and share files remotely. Its services include online storage, file hosting, and file sharing.
Box.net was founded in 2005 as a college business project by Aaron Levie (CEO) and Dylan Smith (CFO). It was incorporated in April of that year. Originally based in Washington, Box.net moved to Palo Alto, California, United States in late 2006.

Wuala is a free social online storage which allows its users to securely store, backup, and access files from anywhere and to share files easily with friends, groups, and the world. Tens of thousands of users and thousands of communities around the world are already actively sharing millions of files, growing quickly.
Wuala is based on a revolutionary technology that was researched for the most part at ETH Zurich (Swiss Federal Institute of Technology).

MyOtherDrive is a leading Internet service offering tools for managing and sharing data online. The service enables users to backup, share, and search files online. MyOtherDrive is one of the fastest growing online storage companies on the Internet. With millions of files, folders, and content backed up online by customers.
MyOtherDrive sharing services offer public sharing, private sharing, and no sharing. Publicly shared content is indexed and searchable.

Cloud storage and file synchronization is becoming increasingly important as users access the Internet and their data via a plethora of devices – desktop computers with large hard drives, laptops with smaller drives, and netbooks and mobile devices with relatively small internal storage.
Here’s our shortlist of some of the most popular Cloud Storage and file syncing Web Services: