Here are the latest iPhone/iPod touch/iPod/iPad apps. You can find ’em at the Apple App Store (http://www.itunes.com/appstore/).

Comcast Corp. says its Xfinity TV service now enables customers to watch many of their top favorite TV programs and movies On Demand directly on the iPad either at home or on-the-go. This new feature is available as part of an updated version of the Xfinity TV app, which is offered for free to Xfinity TV digital customers. You can learn more at http://macte.ch/JONUu .

RiMetric Games has announced Drop-Up for iPhone, iPod touch and iPad users. Drop-Up is an US$1.99 game that offers players a 3D gaming environment. Gameplay allows players to find the best position for their game pieces by spinning grid cubes against an earth at night background. The grids can be viewed from any direction and angle, inside and out. Up to four human or computer-generated players can participate in this challenging, strategy based game at one time.

DooLabs has released Zen! 1.0, an oriental-themed game for the iPad. The app — available for a limited time for $0.99 — is designed to relax your body and mind. The player has to tilt his device in order to move the colored balls and channel them into the holes with the same color, avoiding the obstacles.

ClueTrust has introduced Cartographica Mobile GIS for the iPhone, iPad, and iPod touch. The $79.99 app lets you view, edit, and create location-based information in the field without having to carry around specialized equipment. You can store and access local data, or use CartoMobile with your existing Spatial Data Infrastructure. You can dock with your computer and load the files directly into your desktop GIS.

Studio Pepwuper has unveiled Megan and the Giant 1.0, its first episode in a series for iOS devices. Megan and the Giant is a story and character-driven family stealth adventure game. Players will guide Megan on a journey to rescue a mysterious new friend on the $0.99 game. You can sneak around London with the intuitive tap control, and outsmart the pursuers with strategic planning and the use of various items.

We Are Colin has debuted Triangular 1.0 for iOS devices. It’s a $0.99 game that brings a new puzzle-aspect to the match-3 game genre. Players must match the colored gems of adjacent triangles in order to solve puzzles and progress through the levels.

Five Talents and Beyond have updated Catchif for the iPhone, iPod touch and iPad to version 1.0.3. The free app offers global real-time location tracking in a private environment. Users control who is able to view their real-time location and movements and can block specific locations or become invisible. Facebook integration lets you share locations with friends through Facebook.

Simply Postcards has announced update that includes new border options, a custom border feature, and now users can also mail postcards directly from their web site. The free Simply Postcards app is available on iPhone, iPod touch, and iPad, and all users receive their first postcard free. Simply Borders are organized into four categories, and users can also create their own custom border and apply it to any image.

Dev4phone has updated Ear Trainer 1.6 for the iPhone, iPad and iPod touch to version 1.6. The $6.99 app designed to help train your musical ear and is aimed at musicians, music students and anyone interested in musical theory and improving their aural skills. Ear Trainer includes lessons and exercises for interval comparison, interval identification, chord identification, chord inversion, chord progressions, scales and relative pitch.

Sophiestication Software has rolled out an update to its Wikipedia app, Articles, for the iPhone and iPod touch. Version ($0.99) provides multiple new features, including enhanced article rendering, Read Later, in-page text search, and print support.

Pi’ikea St. has updated Interactive Alphabet for the iPhone, iPad, and iPod touch to version 2.0. The $2.99 app is designed to help in the learning of the ABC’s. Version 2.0 introduces additional sounds and interactions on several of the letters of the alphabet and more.