Collaboratous is the iPhone/iPad app for a project management tool that is super easy to use both for software projects or project that have no relation with IT e.g. a Post Office. The main goal of Collaboratous is the simplicity, everything you need to manage the project with ease to its success is accessible in a primitive and easy fashion.
Key features
Add projects and grant access to people you want to work with
Manage task (or todos however you call them) divided into tasks
Track the progress of the tasks - see what you have to do, see what stuff assigned by you is completed, decide whether to accept it or not
Focus on a task, review its details, review/add comments.
In a nutshell its super easy to keep track of all your projects and stuff you need with Collaboratous.