GoodReader, the iPad PDF viewer gets an important update today. The app now supports annotations, including notes and sketches. The app is considered by many to be a must-have for viewing documents on the go, and this addition will help users do more with their iPad besides consume content. The great news is that the notes and highlights are visible in the PDF document when you reopen it or when you transfer it to your computer. The bad news is that it does this by adding the information to the PDF file, meaning that if you forward the PDF to someone else, they have no way of viewing the document without…