Google Apps are an essential set of online tools that help Enterprise Businesses to communicate and collaborate with their associates effectively. Google Apps offers the ability to share & collaborate word processing docs, spreadsheets, presentations, calendar, setup new email accounts, email security and setup web pages.
For more details about Google Apps for Enterprise
http://www.google.com/apps/intl/en/business/index.html
Customer feedback(stories) - For Google Apps for Enterprise
http://www.google.com/apps/intl/en/business/customers.html
Google Apps for Enterprise - FAQs
http://www.google.com/apps/intl/en/business/faq.html
Google Apps for Enterprise - Video
http://www.google.com/apps/intl/en/business/collaboration.html