A new product that makes the best stuff in Reader more accessible for every one. You can get more stuff based on your interest it uses technology behind 'Recommended Items' in Reader. It doesn't need to sign in, Just click button as you browse button and reader play will recommend you more based on the stuff you like. The Google reader blog said that
"We think Reader Play is a fun way to browse interesting items online that you wouldn’t find otherwise. We designed it especially for people who don’t want to spend time curating their own set of feeds — but folks who already use Reader can easily use it to read their feeds as well. Just click the feed settings menu on any feed in Reader and select “View in Reader Play.” We’re launching Reader Play as an experiment in Google Labs so that we can test it out, get feedback from you and then improve it as quickly as possible."
So have a try at http://www.google.com/reader/play
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Official Google Blog: Finding awesome stuff online with Google Reader Play