An apt-getable archive is now available at crosswire with additional
modules that you can install. Add this line to your sources.list 

deb ftp://ftp.crosswire.org/pub/sword/packages/debian woody main

Please report any bugs with these packages to the sword package,
priority wishlist.

You can also download modules from:

  http://www.crosswire.org/sword/modules/

then install modules in /usr/share/sword

# cd /usr/share/sword
# unzip ~/SwordMod.zip

That method of install is not supported.

Alternatively, for use on a user by user basis install them to 
~/.sword

Also, feel free to join us on irc.openprojects.net #sword

:)
Daniel