Then (if you're on Android) it's available on the Google Play store. No need for a special invitation. (And, yes, in grand Google style, it's still considered Beta.)
Reshared post from +Doug Dunfee
Ingress beta for Android now open to all augmented reality fans
For the past year, the Ingress beta has been as much an exclusive club as it is an augmented reality game — you’ve had to request an invitation to play.
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I have five invitations, or maybe it was ten invitations, that I never got around to sending out to anyone.
Ditto. I asked my friends and, eyeing how much time I was spending doing it (or being iPhone users), they all shook their heads politely and backed away.