The 770 has a built-in microphone: Josep Torra is quite advanced there, check his tuner tool at http://n770galaxy.blogspot.com/ or from maemo.org.
No simple recorder yet. Or even simpler, what I would like to have: the option to add microphone input to the music from the media player. Why? Because I have tight in-ear speakers, and it would sometimes be nice to add ambient sound ...