Available at the iTunes App Store for $4.99, Goodreader is an indispensable app for viewing just about any type of document on an iPad. Using this app, you can view: MS Office, iWork, and HTML documents; PDF documents; audio, video, and photograph files; and even the contents of compressed zip folders. Not just a file viewer, you can use GoodReader to organize your files and transfer them between devices through a WiFi connection or integration with Google Docs and DropBox. Additional features include the ability to annotate PDF documents and text searching capabilities.
If you are looking for a free and easy-to-use task management tool to use on-the-go, consider trying Wunderlist. Available on a variety of mobile devices as well as PC and Mac computers, Wunderlist is a web-based tool where you can create and manage lists of daily tasks to complete. Tasks can include notes and can be set to push e-mail reminders or notifications to keep you on schedule. You can even share your task lists with others through e-mail or sharing directly with other Wunderlist users.
Evernote is a note-taking utility that is great for gathering research and study resources all in one spot. Notes can consist of typed text, hand-written messages, images, Website screen shots, links, audio clips, and attached files. Keywords and tags can be added to your notes so that you can search your notes for the information you need. Evernote can be accessed on traditional computers and on mobile devices. When you synchronize your Evernote account across devices, you will have access to all your notes anywhere you go.