Mine was a NEX-iA. Fairly unknown and fairly unsupported. It used CF cards and AA batteries (the model I bought delivered with a 1GB microdrive- luxury!). It got me through many flights.
The follow-on model NEX-Black didn't quite make it to market before the company collapsed. I found one on eBay for cheap. Sort of an upgrade, but not by much. Still have both units, but haven't used them in a while.