Google Plus is one of the fastest growing social networks ever. If you haven't created a personal account I suggest you do it now. If you have a Google Apps account login to that first and then create your G+ account.
Google Plus lets you add people and brands to circles. You can then share content to all or one of your circles. You can tag brand pages in your updates using +PageName
For all the information about Google Plus for businesses click here
To create your brand page on Google Plus click here
3 News is hot off the mark creating their Google Plus page - check it out here
If you create a Google Plus brand page for your business please share the URL by leaving a comment on this post so everyone can add you to their circles.