It’s a PDF reader that works properly and can download PDFs from my various online RPG libraries – and with a remarkable lack of fuss for an Apple product. The interface for reading those PDFs is likewise intuitive to use; I haven’t done any marking and/or editing yet, but it looks like it’ll be helpful there, too. If you were planning to use your iPad 2 to store gaming documents (and have them on hand for games), GoodReader looks like a good bet at five bucks. I may even be able to cut down on my print library a little.
I mention this largely because I routinely use this forum to scream about the iPad’s frustrating unwillingness to do things that are really very, very simple: so it’s only fair to note when it works right, too.