I had Goodreader on my old iPod Touch but didn't use it much. I also bought it for my iPad and have been using it to read pdfs. It takes some time to get used to, all the options felt a bit too much at the beginning and there was some frustration involved, but I am liking it more and more, especially since I learned to integrate it with my brand new Sugarsync account. There's a lot you can do with this app, and I'm still learning. It could almost be a stand-in for the missing file manager I've been complaining about.
