That is, you cannot add "Robert Scoble" to different circles such as "friends" and "Tech feed" - you must choose EITHER "friends" OR "tech feed".
This draws difficulties [and again I haven't used it so please someone clarify if I'm wrong] - if I have a friend who is both a work college and a friend ? Where do I place this user ? I'm assuming "lay tech" people will want the ability to overlap contacts ?
Edit: great thanks for clarifying! :)
Also you don't know which circle you have been added to, so no worries about other peoples feelings....
Oh and if you want an invite, put your email in your gorram profile.
The neatest thing is the "hang out" mode where you can video/audio/text chat with up to 10 people. This mode already has a neat youtube plugin so everyone can watch the video/movie and comment on it.
I wonder if the API has a "mutual friends" call, you could write that pretty easily if so.