Google is offering commercial version of popular services such as gmail, Google Talk, Google Calendar, Docs & Spreadsheets, Page Creator and Start Page for $50 / user account / year.
So whether you’re a small business or a Fortune 500 company, Google can power up your organization with the right services and support, for the right price.
With paid service you get 10GB email account and other features.
Google also provides the 99.9% uptime guarantee for gmail using Google Apps Premier Edition, as described in their Terms of Service.
You can try Google Apps Premier Edition for free through April 30th, 2007.
=> Found via official Google blog Google Apps grows up