As one of the lucky few to get an invite to Google + so far, I’m always on the look out for the next wave of associated tools. I’ve not yet had a proper play with Google +, but first impressions are positive. To find out more I can recommend this post: Chris Brogan’s The Google Plus 50
One of the first tools you probably want to look at is http://gplus.to/ which is essentially a link shortening tool, which is useful for adding a Google + account in your email signature or similar. I imagine Google will create some sort of official app soon, but in the meantime this is very simple to use, so why not give it a go!