Well, I had heard a lot of talk about the power of the GoodReader app for the iPad and I finally had some time to spend with it. I am currently using the newest version 2.7.7.
It is a very powerful piece of software! Created by Good.iware, GoodReader is available for the iPhone, the iPod Touch, and the iPad. Some of the add-on features cost money if you are using it on the iPhone or Touch, but the iPad version includes all of the features for no cost.
Okay, GoodReader is a great PDF file reader. However, it can also read Word, Excel, and PowerPoint files. It can hook to MobileMe, DropBox, box.net, and other WebDAV servers. It can interface with iMap and POP email servers and FTP servers. You can move files up and down with it to and from all these places. You can connect to your Google Apps and Google Apps for Ed documents for easy access and transfer of documents, too.
You can download Web pages through Safari for offline reading. You can download and play videos and audio files. It will reformat a PDF file as plain text for easier reading if you need it to.
There are several ways to get files to and from the computer to the GoodReader app and vice versa; there is a wireless transfer option, connection to online file storage sites and email attachments, and more. (There used to be a way to move files back and forth via a USB connection between the device running GoodReader and the computer, but that was removed at Apple's request a few versions back.)
GoodReader does so much, you will probably find yourself using it all of the time! It truly is the one of the best $.99 purchases you will ever make for your iPad!
Useful links to learn more
Photo courtesy of ChrisDag via Creative Commons licensing.