Google started expanding the Gmail universe by offering the initial 1000 invites the opportunity to invite up to 3 more users each. Then about a month or two ago the most active blogger.com users were offered an account. Once you have an account for a month, you can invite more users. After your invites have an account for amonth they are offered the opportunity to invite more users.
Today Google sent out an email to AdWords advertisers offering Gmail accounts which should increase the number of Gmail users significantly. I’ve been getting random requests for Gmail accounts lately. I had posted my Gmail address on this blog in the past but have taken it down. I am only sending invites to people I know at this time. Soon enough it will be as easy to get a Gmail account as it is to sign up for a Yahoo account.