Google at the Google I/O conference today said that the +1 Button is coming in "Weeks", and also gave developers a preview of how the Google +1 button can be inserted into websites, some of the stats it'll offer and said it would be available "in a matter of weeks."
The button will have a counter display similar to how other buttons from Facebook and Twitter work. The image over on the right is a mockup of how it might look at the Huffington Post, as created by Google.
Installation for most people will be done by using a simple code generator that allows setting of size, whether to include a count and other options. Here's a prototype:
The "JS callback function" will allow developers to have the button do perform post-click actions that program themselves, such as have a different visual display or track special analytics.
If you've your own login system, you can use this to create your own local record of what has been +1′d (that's how Google says it writes the act of +1′ing something) on the site. The buttons are available in a range of sizes:
After enough +1 activity for a particular site, you'll be able to view anonymous data. The reason for the threshold is to protect privacy (if you only had a couple of +1s and reported data, potentially, a publisher could guess at who might have used the button).
Here's an example of how the activity stats screen might look, showing things such as total number of +1s that've happened or happened off your own site (such as through search):
Google stressed not to read too much into the slide above or the ones that follow, because exact features might change. And, if there's data you want, please leave a comment -- they'll be looking.
With the search activity, the idea is to show how the activity looks for "annotated" versus "non-annotated" links. Annotated means that there's a result that has +1 activity associated with it in the search results, not that it has been annotated with an actual comment.
Here's a prototype report:
Who has +1′d your site will also be reported in aggregate, such as by age and sex:
These reports will be available through Google Webmaster Central, when the buttons are released. So, if you haven't yet registered your site, there's another reason to do so.