Hola, The Ars review (while super awesome) was actually completely unexpected and unsolicited. I realize that we first posted about AeroFS almost two years ago, but we haven't been idle, and we have been releasing invites regularly. Users have also been able to invite other users to AeroFS from day one, and many of them ahve been doing this.

We keep AeroFS in private beta mostly because we have an already overwhelming amount of feedback to work with. We want to make sure that we make the users who are with us today (and who have been with us for the past two years) as happy as possible, before releasing it to the masses.

Cheers, Yuri

(ps. sorry for the late response, today was the last day of one of our interns and we took him out for lunch)