Crocodoc is a file sharing website where you can annotate and edit PDF files, Word documents, images, etc. Using Crocodoc allows students to annotate and collaborate while engaging in literacy and writing.
TLC 2013 presentation on using Crocodoc Personal and PaperPort Notes to engage students in critical reading and close reading strategies.
This is a link to a pdf article on students with reading disabilities and strategies to help them improve. We are going to practice critical/close reading strategies with this difficult text to experience the process our students would go through in class.
This blog post provides a top ten list for annotation apps for iPad. I use PaperPort Notes in my classroom.