One of my hosting clients has signed up to beta test "Gmail for your domain" and will be moving their e-mail accounts to this service.  I think I read rumors about this service a while back, but didn't know it existed yet.

Pros:

• Google provides the same Gmail Web client for your domain -- for Free
  
• 2GB of space for every account you create for your domain
• Control panel to administer accounts, and even a bulk upload tool to add many accounts at once
  
• Free POP access, in case you want to download all your e-mail to Outlook or some other client so that you have your e-mail offline
• Use your domain accounts with Google Talk instant messaging service
• Customized logo for your domain
  
• Free.  Did I mention 2GB of storage for each account, free?
  

Cons:

• No tools (yet) to transfer your existing e-mail
• Does not work with the Gmail Notify service
• Not integrated with Google Calendar (yet)
  
• In Beta, so you have to apply and hope you're selected to use the service
  
• In Beta, 'nuff said
  

I'm tempted to apply for the beta, at least for one of my domains.  I love the Gmail interface.  If for nothing else, Gmail does a pretty good job of filtering spam.

What do you think?  Is this a great idea, or scary to think about Google having all the e-mail for your domain?