Box.net - the Universal Online File Viewer.

Maybe you needed it, or searched for it. Or maybe it didn’t cross your mind it exists. But it’s here. The best online universal file viewer. Box.net’s file viewer takes documents and makes them viewable in a Flash-based viewer making it easy to see access and share information without installing extra software.
Users can organize and view all of their content on-line in a friendly file and folder arrangement, share content with direct links to files and folders, convert any folder into a public web-page in one click and generate widgets to share files on a company web page or blog. Any folder can become a shared online workspace where people can invite others to view, edit, or add their own files. Work-flow organization tools are also included, real-time activity feed on file uploads, downloads and comments, as well as individual activity feeds, you can add tasks, assign them, approve, review or update.
The Box Business edition, offers extra security with 256-bit SSL encryption, passwords and expiration dates for file and folder access.

The best feature is of course the ability to instant view files without leaving your browser, from Microsoft Word, Excel and PowerPoint to Adobe Photoshop and Flash video content. A business oriented application, the software includes:
User management: Manage user settings and permissions easily in a centralized administration console. Add and delete users individually, import users in bulk, set login credentials, allocate storage quotas and designate file and folder permissions.
Security and permissions: Select what folders individuals and user groups can access. Designate access permissions, including editing, viewing, previewing and uploading.
Password management: Password-protect files and folders and set expiration dates for shared file and folder access. Make mass user password resets. Determine password strength. Require users to reset passwords periodically and on initial login, based on your security policies.
Reporting: Access a complete audit trail of what’s happening with your company’s files on Box. Generate and export file and user activity across. Run reports on logins, downloads, edits and uploads for a specified date range. Find and sort usage information based on logins.
Groups: Manage users and set access permissions by a company department or project team. Create user groups, add/delete users, and select what folders they can access and what access permissions they have for each folder.
Custom branding: Customize the Box interface and login page to reflect your company brand. Add the company logo, select a color scheme and add other basic information, such as a link to the company homepage.

Box alternative seems to be a good business solution to save money, time and energy. Give it a try here: https://www.box.net/signup/business