The highlights for Chrome 30 include easier searching by image, new apps/extension APIs, and a number of stability and performance improvements.
Google's "search by image" support lets users right click on an image to search Google of that image. Chrome for Android users also have a number of new gestures with the latest Chrome.
Chrome 30 also has more than 50 security fixes for which Google handed out thousands of dollars in rewards.
More details on the stable release of Chrome 30 can be found via the Google Blogspot page.