Google Apps Premier

Google Apps Premier offers 24/7 phone support and a 99.9 percent service-level agreement for Gmail uptime.

Purchasing is done through Google Checkout. Google is offering a free trial through April 30.

After you verify your domain, you can manage your settings on the dashboard.

Manage your settings.

Gmail comes complete with 10GB of storage.

Google Calendar is exactly the same, except the top left links only point to other Google Apps Premier services.