GoodReader is my prefered app for viewing PDF files on my iPad. I like it because it supports a number of different ways to get files into the programs, including accessing DropBox and Google Docs. Today I learned that GoodReader has been updated and it now includes the ability to add annotations to PDF files. You can now highlight, underline and strike through text, add notes, and draw on the document. All of the annotations are saved in the PDF file so if you later e-mail the file your annotations are included.
Highlighting, underlining, and striking through text is as easy as you would expect. You simply tap and hold on the text to display a menu from which you can select the various options. Notes display in a separate window that is then indicated by a message bubble icon in the PDF file, to display the note you simply tap the bubble and tap to close it.