PDF reading and annotation are simply awesome using Win8's built-in Reader app. Forget Acrobat reader.
As you can see the full-screen metro Reader is fluid and fast, although the previews of the large 20-something page long pdf took a while to load in the thumbnail screen.
You use your finger to select text and highlight them.
Bring you pen tip and it automatically writes! The transition between pen/finger is instantaneous. There is the same distinction in Office OneNote 2010, where pen is for writing and finger is for navigating.
The app applies some smoothing. You can see the writing looks terrible at first but half a second later they become good.
You can save all the annotations in the Reader app. However one negative is if you switch to other apps by swiping the left screen, then come back to the Reader, sometimes the annotations are not saved. It seems the app tries to reload/refresh itself in multitask situation. So be careful, save often.
Lastly the Adobe Acrobat reader is simply no match. The zooming is laggy. There's no pen recognition. Finger and pen are treated equally.
