Sound input is not a problem with Flash. The mic on the N8x0 is a big problem, period. There doesn't seem to be any ALSA hardware device mapped to it. The only way I've found that works is using gstreamer. There is a gstreamer source called "dsppcmsrc" (in the dsppcm plugin) that accesses the mic. If anyone found a way to get that working in apps that use ALSA, that would be pretty heroic.