Well, I started off in July wanting to do a rewrite of Bunny Slayerhttp://code.google.com/p/blackthorn-engine/wiki/BunnySlayer, but that didn't really get off the ground. Instead, I ended up working some libraries and did some general cleanup.
Blackthorn Starter Pack
One of my goals for a long time has been to make it as easy as possible to compile and run my game from source. As a step in that direction, I created the Blackthorn Starter Pack, which is basically a tarball with all the libraries you need plus a little glue to make things work. See the wiki link for more information and downloads.
http://code.google.com/p/blackthorn-engine/wiki/BlackthornStarterPack
Escalator
For fun I've been working on Escalator, which is yet another experimental object system for Common Lisp. Escalator is inspired by this blog post on Entity Systemshttp://t-machine.org/index.php/2007/09/03/entity-systems-are-the-future-of-mmog-development-part-1/, which are supposedly used in the MMO industry. Escalator is my attempt to provide idiomatic support for Entity Systems in Common Lisp as a high-performance alternative to CLOS.
http://bitbucket.org/elliottslaughter/escalator