Yesterday, I got an email from Google, saying that I could join the beta. All I had to do was make a few changes to the MX records of my domain – sigamany.com in this case. It was very easy to do, and Google’s instructions were easy and clear, and voila, my domain was gmailed!
I had stopped using my navin@ email address because of the amount of spam it was getting. Now that it is being handled by the Gmail spam filters, I should be able to resume using it.
Now, all that remains is for Google to allow you to merge your gmail and own domain email accounts – that would make it perfect!