If you didn't get an email about this from Blogger, then look at your Blogger main page for an invitation. There should be an invitation if you're a registered Blogger user: "As an active Blogger user, we would like to invite you to be one of the first to try out Google's new email service, Gmail."
Rumor has it that the prospect of getting Gmail is so appealing that many are signing up with Blogger just to get the Gmail invite.
Caution, other comments we have seen indicate that the invitation may be a once only deal. If you bail out of the sign-up, you may not get a second chance. Also, it seems that not every invitation is accepted.
