Add the plus one button to WordPress sites
There is no WordPress plugin for it yet, but you can still add it to your blog and be one of the first to have it. And being first is always good, that's for sure.
Add this to header section:
<script type="text/javascript" src="http ://apis.google.com/js/plusone.js"></script> (Remove space after http
<g:plusone href="<?php the_permalink(); ?>"></g:plusone>
<?php the_content(); ?>
Read more how to do on my blog. (Link in signature, too low post count)
Or then you just wait until there comes a plugin. I guess it takes until next week..