ASSS version 1.4.4 has been released as of September 7, 2007. From the site:
September 7, 2007 - Version 1.4.4 is long overdue: it's been over a year, and there's been some very slow but steady bug fixes. I've also merged in some changes from the branches that Hyperspace and Powerball are running. This release hasn't been very well tested and could use some more polishing, but the release of Continuum 0.40 forced it to happen now. 
September 9, 2006 - I've upgraded the monotone server at asss.yi.org to 0.29. The is incompatible with the previous version (0.24) in several ways. You will need to create a new database and fetch everything again, and then create a new working copy.
June 8, 2006 - 1.4.3. This release contains mostly features and bug fixes requested by PowerBall zone, which switched to asss in the last few months. It has contributions from Smong and numpf. Thanks to all of PowerBall, especially Stag Shot, for dealing with all the bugs and spending so much time helping to debug them.
January 14, 2006 - 1.4.2. Sorry for the long wait. The bug tracker has been working well and almost all of the changes since the last version have been based on bugs listed there. There are too many small changes to list here; see the changelog for details. One important change to note is how interfaces and persistent data are implemented in python. If you use reg_interface, reg_player_persistent, or reg_arena_persistent, you'll have to change your code. Oh, and the bricklayer module was renamed to brickwriter, so if you load it, you'll have to update your modules.conf.
October 15, 2005 - 1.4.1. New version with a bunch of accumulated bug fixes, and a few new modules: redirect and obscene.
October 10, 2005. Still no new version, but I've written some instructions for getting access to the latest version of the asss source using monotone.
September 16, 2005. No new version, but now there's a bug tracker available.
June 3, 2005 - 1.4.0. There's a new build of 1.4.0 for windows, to fix a building bug that I really should have caught earlier. Hopefully this is the last of the build-related problems. Use the link for "1.4.0 (windows full)" below.
May 14, 2005 - 1.4.0. There isn't really any new big features here, but it's been a while, and there was some significant reorganization of the source code directory structure and build process, so I figured it deserved a jump in version numbers. Here's a brief summary of all the new stuff since January: User guide updates, fixed no-flags region attribute, improved ap_multipub placing, per-player settings overrides, support for non-whole-byte settings overrides, fixed various bugs (position-based speccing, a crashing race condition, map checksums, deadlocks related to setting ship/freq), tweaked the syntax for multi-commands slightly, rewrite of bandwidth limiting stuff, switched version control from cvs to monotone (instructions coming soon), reorganized source directory structure and cleaned up makefiles and build process, and a slew of ccc features (automkwin, "all" window, auto-reconnect, and ?ignore).