Poor Negative Nimbus. He’s so sad, and so full of water, it’s a challenge to sail across the sky without drenching the happy hot dogs and caterpillars out for a picnic lunch, while still watering the happy flowers along the way. What’s a depressed cloud to do?

Apparently, the answer is to launch on Android, via the Google Play store and the Amazon Marketplace. That’s just what CloudKid’s fantastic game, Negative Nimbus, has done for the holiday season.

Apple’s App Store is widely considered the king of mobile marketplaces — even Android fanatics will admit that it offers a greater selection of high-quality apps and games. But it’s Google Play that’s currently seeing the most growth, according to the latest data from app analytics firm Distimo, while the App Store enjoys more than four times as much revenue.

Do your children ask you every day when Santa’s going to arrive? Now you can show them, thanks to Google’s new Santa Tracker app for Android smartphones and tablets. Built by “Santa’s developer elves,” the new app features a countdown to Christmas Eve, then allows you to track jolly old Saint Nicholas on his journey to children all over the world.

Viber, the popular cross-platform mobile communications service, has today announced that it has now surpassed more than 140 million users across six platforms, with 400,000 people joining the service each and every day. To celebrate the milestone, the company has introduced a number of new features to its Android and iOS apps, including the ability to send “fun stickers” and “playful emoticons,” and support for the iPhone 5’s larger display.

Google’s latest holiday promo appears to involve the Play store and a few incognito elves. These elves will be unwrapping a special play offer each day through 1/1/2013. These offers could be anything from special app promotions to saving money within an app. For instance, today’s offer gives anyone who downloads the app Hotel Tonight $35 to use towards their first hotel booking.