Google launched Google Sites as part of the Google Apps suite.
Google Sites is the easiest way to make information accessible to people who need quick, up-to-date access. People can work together on a Site to add file attachments, information from other Google applications (like Google Docs, Google Calendar, YouTube and Picasa), and new free-form content. Creating a site together is as easy as editing a document, and you always control who has access, whether it’s just yourself, your team, or your whole organization. You can even publish Sites to the world. The Google Sites web application is accessible from any internet connected computer.
Requirement: You need to be using Google Apps at your own domain
To start using Google Sites, visit http://sites.google.com/a/example.com where example is your own domain name.
Google Sites comes in 3 editions: Standard, Premier and Education. Standard and Education editions are free while the Premier costs $50 / user account / year. This page has the comparision table.
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