Tablets are increasingly improving as productivity devices, including viewing and working with documents. My tablet is frequently with me in meetings, perfect for unobtrusively taking notes and marking up documents while following along with the presentation. Read on to discover which annotation, sketching, and note taking apps for iOS, Android, or Windows 8 tablet are best for you...
Penultimate: This app is the one I most frequently use when it comes to handwriting notes and annotating images. Why do I use it so often? The ability to search through handwritten text and the awesome Evernote integration. Free
GoodReader for iPad: Although this app handles annotating PDFs beautifully, the real winning feature is the way that it connects to a variety of services including WebDav making it the ideal iPad companion for document management. $4.99
iAnnotate PDF: With this app you can mark up your PDFs and organise them neatly and it's easy to see why it's one of the most popular PDF annotation apps in the Play Store. Also available for iPad ($9.99), although the iPad version has more features including Dropbox integration. Free
Soonr Scribble: One of the things that sets this annotation app apart from some of the others for Android is its ability to work with the Samsung S-Pen. The app is also part of the Soonr cloud which enables sharing across devices including computers both Mac and PC. Also available for iOS ($4.99). Free
ezPDF Reader Multimedia PDF: Hands down the highest rated and most popular PDF annotation app for Android. In addition to supporting PDFs it also support ePubs. Dropbox integration is included and with an additional free plugin app it will also integrate with Google Drive. Also available for iPad. $3.99