Reeder 3.1 ($3) - Reeder allows users to access their Google Reader account from an iPhone or iPod touch. The application is able to sync information with Google Reader and allows users to browse content by either feed or folders. The v3.1 update introduces Feedbin sync support as an alternative to Google Reader. The app can also now be used as a standalone reader without syncing, and numerous bugs have been fixed. [Download - 7.4MB]

Angry Birds HD 3.1.2 ($3) - Angry Birds is a physics-based puzzle game where players take control of a fleet of irritated birds. As players progress through levels they can earn additional power ups to help earn three star ratings and in turn unlock additional content. The update addresses some minor issues in order to improve the user experience. [Download - 47.4MB]

StepPolyArp 2.1 ($12) - StepPolyArp is a a MIDI step polyphonic arpeggiator for the iPad that is capable of transmitting MIDI information to a Mac or PC, which can then be used in combination with any sequencer, virtual instrument, or MIDI synthesizer. Version 2.1 adds Audiobus support, allowing the app to output audio directly into other apps with Audiobus support. [Download - 9.6MB]

Duke Nukem 2 1.1 ($2) - Duke Nukem 2 is an iOS port of the classic side scrolling shooter that features all 32 of the original levels. The v1.1 update introduces a new Cinema Mode that hides the frame, as well as an option to add a separate jump button. An error that prevented the game from starting on some iOS 5 devices has also been resoled, and both iCade and iCade 8bitty support has been added. [Download - 45.5MB]

Retrica 1.1 (free) - Retrica provides users with 40 unique filters for creating vintage-style pictures on any iOS device. In addition to vintage filters the app also includes a crop tool, vignetting, and various borders. Version 1.1 introduces 16 new filters and expands the range of the self-timer. Additionally, the update now supports both geolocation and EXIF information. [Download - 25.6MB]