Planning and creating an intranet

Most organizations devote considerable resources into the planning and implementation of their intranet as it is of strategic importance to the organization's success. Some of the planning would include topics such as:
The purpose and goals of the intranet
Persons or departments responsible for implementation and management
Functional plans, information architecture, page layouts, design.[4]
Implementation schedules and phase-out of existing systems
Defining and implementing security of the intranet
How to ensure it is within legal boundaries and other constraints
Level of interactivity (eg wikis, on-line forms) desired.
Is the input of new data and updating of existing data to be centrally controlled or devolved.
These are in addition to the hardware and software decisions (like Content Management Systems), participation issues (like good taste, harassment, confidentiality), and features to be supported[5].
The actual implementation would include steps such as:
Securing senior management support and funding.[6]
Business requirements analysis.
User involvement to identify users' information needs.
Setting up web server(s) with the appropriate hardware and software.
Setting up web server access using a TCP/IP network.
Installing required user applications on computers.
Creation of document framework for the content to be hosted.[7]
User involvement in testing and promoting use of intranet.
Ongoing measurement and evaluation, including through benchmarking against other intranets.[8]
Content is King: A successful Intranet project engages its viewers and provides them with immense corporate value by:
Feeding the Intranet: Key personnel must be assigned and committed to feeding Intranet consumers. The alternative for your project to become the "yellow-pages" (a tool that is used as a last resort).
Keep it current: Information that is current, relevant, informative, and useful to the end-user is the only way to keep them coming back for more.
Interact or "Listen": Allow your users to create content. Social networking must be an integral part of any Intranet project, if a company is serious about providing information to and receiving information from their employees.
Feedback: Allow a specific forum for users to tell you what they want and what they do not like.
Act on Feedback: Your users of the Intranet are typically the employees of the company with their finger on the pulse of your industry. Those that are in the trenches on a daily basis will be able to tell "corporate" what trends are happening in the marketplace before any news source. This two-way communication is critical for any successful Intranet. Company executives must read the input and create responses based on the company's direction. Otherwise, what is the point of any employee taking the time to respond. If an employee submits their opinion or their observation, they need to feel that they have been heard. This is accomplished by:
Require management to review Intranet posts on a daily basis and respond to the poster. Let them know that their post has already been addressed, is being reviewed, or is being elevated to a department head. This ensures the poster that their post has been read and is being acted upon accordingly. If they do not receive feedback, they will discontinue posting.
Broadcast feedback: The ideas that make it into the "this is a great idea" bucket, should become "news-worthy". This makes the poster feel useful and encourages others to follow.
Log Feedback by User: This information can be useful when considering an applicant for promotion/transfer, etc. It will also let you know who is focused on the company's benefit and not just "filling a position".
Require Executives to provide daily/weekly content: Everyone wants to hear from the person(s) they are working for. The Executive Team needs to lead the way in communicating the company's vision to their associates on a frequent (daily, if possible. If not, no less than weekly) basis.

source; http://en.wikipedia.org