Kongregate Arcade is the official app from Kongregate, one of the most popular browser based gaming sites. In Kongregate Arcade, they have brought more than 300 games to Android.
The app supports player profile, ratings, achievements and other statistics. The interface is beautifully laid out and games can be browsed based on the category, ratings etc. Like in the normal Kongregate website, users can earn badges for their achievements in the games. If browsing through 300+ games seems a bit daunting, there is a category of staff picked games.
The games are Flash games and works very smoothly on my phone. There are some seriously very addictive games in their list. Right now Zilch Mobile is a favorite of mine.
The best part of this app is that it is completely free. However, since it requires Flash, it will run on only Android 2.2 and above.
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Unfortunately the app has been pulled from the market after only one day. But you can still download it from Kongregate's website and install it.