PDFpen 1.3 ($15) - SmileOnMyMac recently unveiled a new 1.3 version of PDFpen, its fully-featured iPad tool that allows users to edit and create PDF documents. The latest release adds support for Bluetooth pressure-sensitive styluses, including the Jot Touch from Adonit, and Ten One Design's new Blue Tiger. [Download - 22.8MB]

Gmail 1.3 (free) - Access your e-mail account with ease through the updated 1.3 Gmail app for mobile devices. The new version of this program now offers smoother animation and scrolling on the iPhone and iPod touch, multiple bug fixes, and the added ability to save attachments to your photo library. [Download - 7.7MB]

Amazon Mobile 2.0 (free) - Amazon Mobile enables users to browse products from their online store, as well as compare prices and read reviews. With the new 2.0 version people can browse products by category with Shop by Department, and can save five to 15% on products through Amazon.com's Subscribe and Save feature. [Download - 5.6MB]

Projectbook 1.0 ($2) - Projectbook is an all-in-one note creation and to-do list management tool designed specifically for the iPad. It can be used to create hand-drawn notes or sketches, record audio, and take photos. Support is offered for importing web pages from Instapaper or Pocket, and for importing files from Dropbox. [Download - 29.6MB]

Plight of the Zombie 1.04 ($3) - Spark Plug Games provides an interesting take on the zombie situation with its latest game, Plight of the Zombie. The new puzzle game has players helping to lead zombies to their new meal through 30 challenging levels. Additionally, an in-app store is available for purchasing stylish accessories for your zombie. [Download - 46.4MB]