Since the initial release of Chrome three months ago Google has been hard at work releasing 14 updates to the browser to this point. Google maintains this 15th release has reached their goals for stability and performance thus the need to drop the beta label. The Google team does add however that the "work is far from done. We are working to add some common browser features such as form autofill and RSS support in the near future. We are also developing an extensions platform along with support for Mac and Linux."
If you are already using Google Chrome, the update system will push out all the newest bug fixes and security patches, so you will get the newest version automatically in the next few days. If you haven't used Google Chrome for a while, now might be a good time to give it another spin, you can click here to download the latest version.