Google is opening a beta test for bringing Gmail to your own domain.
This special beta test lets you give Gmail, Google’s webmail service, to every user at your domain. Gmail for your domain is hosted by Google, so there’s no hardware or software for you to install or maintain.
Gmail – 2 gigabytes of storage and search tools that help users find information fast.
Control Panel – Easily manage user accounts, aliases and mailing lists.
If you want to be a part of Google’s Gmail for your domain program, you have to sign in with a Google account and then give Google some info about your domain. They’ll let you know when the beta is available (don’t call them – they’ll call you).
Reffer to this Page to Participate – Gmail for your domain