Online Storage services vary considerably. There are the really open storage services that enable you to access your files through using any browser, or there are those services that use a proprietary pieces of software.

The Web 2.0 Directory from eConsultant provides a list of 30 or more online storage and transfer services.

It seems one of the best services is OmniDrive recommended by Read/Write Web (10 Must Have Online Office Apps), Mashable (80+ File hosting and Sharing Sites), and Webware (Box.Net Rolols Out Microsoft Office Web Storage Plug-in).

OmniDrive provides you access, editing and sharing of your files from anywhere with just a web browser although you can download a client for Windows or Mac users. You can also store files created by other online services, such as files you create in Zoho applications.