After the recent upgrade to Google Maps for mobile, Google is quietly continuing to add more features and enhancements to many of its online products.

Users of Google Reader now have their very own personal recommendation engine. Visit your discovery page to find a list of “interesting” recommendations from Google… based on other feeds you subscribe to, as well as your Web History data.

Google Reader also now supports drag-and drop subscription management. With this, you can now easily move feeds between folders, as well as reorder things up and down within the list. This is something desktop aggregators, and even other online feed readers like Bloglines and NewsGator, have had for a while. Better late than never.

Other Google properties have also seen some enhancements. Group chat in Gmail/Gtalk allows you to chat with multiple people in one single window. Along with group chat comes a new set of emoticons for your chatting pleasure.

Google is also flirting with some interesting digg-like experiments. The objective here is to empower you to influence your search experience by adding, moving, and removing search results. When you search for the same keywords again, you’ll continue to see those changes. If you later want to revert your changes, you can undo any modifications you’ve made.

While Google explains this experiment in detail here, I couldn’t find any link to try this. Hmmm. Looks like only a select few have been invited to play with it.

Have you tried any of these new features from Google? What’s your experience?