Open project list for further development:

libvorbis:

Meaningful error code returns

still some padding at EOS

Option for brute-forcing vq search on maptype 2 (helps on undertrained
sets).

encoder switch interface for binary compat through changes; ioctl()-like?

API changes: 
  break up some of the more monolithic calls (eg, allow access
       to MDCT domain data, additional low level framing capability)
  convenience calls for text comments

other:

command line suite
'crashme'