The project has released v0.1.6 which is apparently already playable. There is a project page
It currently works on Unix-like systems with ACL, CLISP, CMUCL, SBCL and LispWorks. A port to LispWorks Windows has also been done. Langband will probably be ported to other Lisp-implementations as the code grows more mature. Debian-packages exist in 'debian unstable', and 'debian woody' packages may be found on www.langband.org. Langband is distributed under the terms of the GPL and has been written by Stig E Sandø.