If you're the sort of person who records conversations, there's still some merit to having a discrete voice recording device on hand, if for no other reason than being able to set it on a table to indicate that you're about to start recording. (Which can be distracting to some, of course, but when you're interviewing people you have to use whatever techniques work best to get them talking.) I've used various voice recording applications for smartphones over the years and while some work better than others, it's nice to get something solid state.
This new "Card R" voice recorder from Narae Inter is just 6.5mm thick and includes 1GB of internal memory (enough for 72 hours of recording) and a built-in USB cable, as well as a headphone jack. No details on price or availability; I suspect you won't see this one outside of Korea for a while, if ever.