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Great news, just got an invite to test Google Hosting [Email only].
The setup was a breeze. Initial setup has few hundred free accounts 
Google hosting has two main components :
1. Google Dashboard [Admin Only]
2. Google Gmail Inbox [per user]
You get all the features of GMail like Inbox [2Gb], Calendar, Contacts, and Chat to name a few. Dashboard has all the controls to setup accounts manually or import through CSV files.
How did you get the invitation to Google Hosting?
Well I have been involved with beta-testing some of other Google services before like Calendar, Chat and more recently Spreadsheet [excel replacement, review coming soon]. So got an invite to this test as well.
Damn… Google Hosting!! Whats next?
google is Rocking the internet .