so it seems like the invites are pointless since last night they just let anyone who signed up in regardless of having an invite.
You just have to be lucky and be online when they happen to open it up.
No, you have to be invited *and* create your profile right away.
I have some friends who got invited on the first night but were late to register and got their 'over capacity' message. They were late again last night to create their profiles and got the same message again.
I have some family members who I invited last night for the first time and got in, because they were online and immediately created their profiles.
I also have heard from people who haven't been invited, tried going to
http://plus.google.com without being invited when they were 'open' last night and they couldn't get in. So you still need to be invited.