i'm starting with interviews soon so have been looking into recording devices. i found
http://www.audiotranskription.de/english/
to provide a good overview and comparison. i don't have any experience with focus groups but am thinking about maybe getting a device that is not just good enough for interviews but would also be up to later projects involving focusgroups. it seems to me that the zoom H2 looks promising for this purpose. olympus ds series could also work. olympus ws series is cheaper and probably not quite up to focus groups.