From 9to5Toys.com : . For a limited time, Walmart.com is offering a $100 downloadable Apple iTunes/App Store gift card for just $80. These popular gift cards can be used on iBooks, iTunes Movies, Videos, music, Mac and iOS Apps.

Tapbots appears to be making significant progress on its upcoming Tweetbot for Mac Twitter client. The development team issued an initial alpha version of Tweetbot for Mac less than two weeks ago , and late yesterday, the company released a much improved version of the alpha. The new update, notably, includes support for OS X Mountain Lion Notification Center, keyboard shortcuts, and the new build also contains many performance improvements.

By far the biggest app news today is the announcement that popular Mac and iOS email client Sparrow has been acquired by Google , but below is our usual list of all the notable apps and updates hitting the App Store: djay for iPad version 1.5.1: djay for iPad received a significant updated today that brings support for Numark’s upcoming iDJ Pro controller for iPad arriving in September.

The iPhone includes a great built-in weather application that is easy and intuitive. However, an even simpler, more intuitive weather application for iOS is making the rounds today . It’s not an App Store app, but a free web application for iOS Safari called Sun

Checkmark is a new take on Apple’s Reminders app with additional features and a clean interface.

Along with Tiny Wings

As we reported earlier this week , Tiny Wings 2.0, which is a free update of the original, is now hitting App Stores around the world.

The sequel to the wildly popular iOS game Tiny Wings is arriving July 12, and the creators have put together an interesting trailer. Tiny Wings has previously been compared to Angry Birds in terms of addictiveness

Scanner Pro , an intuitive scanner application for iOS, has been updated with iCloud support and a revamped user interface for the iPhone. The scanner application is popular amongst productivity users, the developers tout

A group of developers in Russia recently launched the “HackStore,” a centralized location for third-party OS X applications. Like Cydia on iOS, the HackStore is a software hub that allows developers to distribute applications without having to endure Apple’s approval process. The developers behind the project claim that piracy will not be tolerated in their app store, though it is unclear exactly what measures they are taking to prevent pirated software from being distributed through the HackStore.