Cards 1.0.1 (free) - Apple has launched a new 1.0.1 version of Cards, its app that lets users create customized greeting cards with personalized text and photos. The latest version offers several important changes, ranging from enhancements to the text entry to improvements in the checkout process. Additionally, the upgrade also offers better verification of postal addresses. [Download - 20MB]

Yelp 5.5 (free) - Yelp for the iPhone and iPad provides users with an easy way to locate nearby points of interest and browse reviews for popular locations. In the v5.5 release users can update a business' hours, address, and categories directly from their mobile device. Other changes include a simpler way to send a business photo via Facebook or Twitter and to add a new business to Yelp. [Download - 16.4MB]

Defenders of Ardania 1.0.1 ($5) - Defenders of Ardania is the latest tower defense game by Paradox Interactive, which has iOS players simultaneously paying for towers, spells, and waves of offensive units while battling different players and factions. The game takes place in the fantasy world of Ardania and features 18 different upgradable towers, a full single-player campaign with three playable races, and multiplayer support. [Download - 116MB]

NanoStudio 1.3 ($15) - A new 1.3 version of NanoStudio, a music creation app for iOS devices, is now available for download. With this release comes both universal iPad support, and an increased size limit for single samples. The song editor has also been greatly enhanced, offering vertical zoom functionality, MIDI activity indicators, easier use of mute/solo buttons, and graphical improvements. [Download - 71.9MB]

Downcast 2.5 ($2) - Seth McFarland recently announced a new 2.5 version of Downcast, the podcast downloader that allows users to listen to their favorite podcasts without the need to sync with iTunes. Included in this upgrade is support for syncing podcasts, episodes, and playlists via iCloud, along with greater support for “now playing” information on car stereos and Apple TV. [Download - 7.7MB]