Tweetbot 2.4.1 ($3) - Tweetbot is a iPad Twitter client that includes multiple timelines, smart gestures, and support for a number of other social services such as Instapaper and CloudApp. The v2.4.1 update adds the ability to toggle smart quotes in the compose view. A crash that could occur when using Droplr for uploads has also been fixed, along with other minor bugs. [Download - 25.4MB]

WhatsApp Messenger 2.8.1 ($1) - WhatsApp Messenger is a cross-platform message service that allows users to send both messages and multimedia. Version 2.8.1 adds support for adding a profile picture, as well as for setting a default wallpaper. A number of minor bugs have also been resolved. [Download - 10.5MB]

Downcast 2.7.4 ($2) - Downcast allows users to download and listen to their favourite podcasts without needing to sync the device with iTunes. The latest release includes a number of iCloud syncing bug fixes, as well as a fix for displaying accented characters. In addition, a problem that caused duration errors in some circumstances has also been resolved. [Download - 26.4MB]

Audio Xciter Studio 1.0 ($8) - Audio Xciter Studio is a digital signal processor designed to enhance the audio quality of iOS devices. The software analyzes the audio signal in real time and applies any sonic changes that it deems necessary. The Studio version also includes tools that allow users to fine-tune the DSP settings to better suit their listening needs. [Download - 5.1MB]

Wikiweb 1.1 ($5) - Wikiweb is a Wikipedia reader designed for for iOS devices. Within the app users can view any Wikipedia article laid out in a mobile optimized format, as well as create custom webs of articles and share them via e-mail or Twitter. Additionally, the app includes support for viewing articles in 45 different languages. [Download - 2.1MB]