There is a forum thread in Notion Addicts that started out with a discussion on using NotionInk’s Adam tablet in archaeology but then was soon broadened to include all of Android. The thread then split into a discussion on the best type of note-taking/data collection apps to create/use for Android for several fields, including archaeology.
I have been looking at the Adam for its transflective screen but I suppose it will be a while before I see one in person.
Paperless Archaeology 