Just got an invite for Gmail for your domain

I signed up for the new gmail for your domain service that Google is beta testing (isn’t Google in permanent beta mode anyway?).  Well, I just received an invitation to turn on the service, along with the option to add up to 25 users to that domain.  At first glance everything looks just like gmail, with ability to make slight changes.  I’ll give this a real test in a few days, and log my impressions here.