Back in the days of my sports era, one of the most colorful people in The Spectrum was "Joe, the Beerman." Joe would walk the aisles of the arena shouting, "beer, beer, get your cold beer here." He also led cheers in the stands, walked around with signs, and became a bit of a cult hero in the stands. Joe basically knew the faster he could sell beer, the colder it would be for the folks in the stands and the more money he'd make per night in tips.
Well, when it comes to Google Voice, I feel a bit like Joe. Part cheerleader (full disclosure I was a shareholder in GrandCentral and my agency did a lot to help with its awareness then) but also someone who has to let you know how to obtain your own GoogleVoice number. I'm doing this because not a week goes by where some reader or friend asks "can you help me get a Google Voice number? And as much as I'd like to help there's an easier way.
Google has posted a sign up page. Simply go to that link and you can apply.
My guess is, in typical Google fashion, instead of awarding all million numbers, they will assign a portion of those and then give each user the ability to invite more users. But, that's only a guess.