Google +1 invitation is pending, I have been invited by three of my friend, still I didn't get any invitation email. So buddy, keep patient and wait until Google+ project is ready for everyone.
you don’t need an account for Google +1 button, its just a code that you have to copy and paste on your website... Here is the source, http://www.google.com/intl/en/webmasters/+1/button/index.html
Yup, he is right: The Google +1 has a "+1 button" which is shorthand for "this is pretty cool" or "you should check this out." On the other hand, Google Plus is a Google project that aims to make sharing on the web more like sharing in real life; just like Facebook.
Agreed with tobycoke when you have a gmail account you can use the google +1 feature which is just similar to "Facebook Like Button", for google plus you need to get an invite first since its still in beta.
Yes, google +1 button like a Facebook like button to share something interesting in your social networks.....
I hope Google will open this service for every one very soon. Then all of us will get account with this service of Google.
its a simple matter. tell your other webmaster friends who are holding the account to invite you. then its just like creating an account