I was thinking the other day that it might be "useful" to port VLC to NaCL, just so that people have easier access to a high quality online video player. It might be useful in some cases (for instance, when people want to embed a player that can play more obscure file types, etc.)
NaCL might have a working Qt interface, dunno
Anyway just throwing it out there.
Cheers and good luck!
-roger-