This version is fully functional, although there are still some missing features. Please report me any bugs you found.
To be done:
See the RODMAP file in the tarball.
You can get the cutting-edge sources using git and or cogito at the following URL (and with the following command, according you're using cogito):
cg-clone http://penguin.fr/git/sshproxy.git sshproxy
Or you can browse the repository.
As usual, patches are welcome.