2.1.8 has been available since Dec 03, 2006. I copied the 2.1.5 ebuild in the tree, and have been using it extensively for the last 3-4 days without issue.
Latest (unstable) is 2.1.5, and 2.1.7+ has features for managing QoS as well, which is a good improvement over what we have now...
2.1.9 is out. Copying the ebuilds works fine.
2.1.10 is out. Copying the ebuilds for fwbuilder and libfwbuilder seems to work fine as well with this version. Some bug fixes and a nice "where used" function. Release notes here: http://www.fwbuilder.org/archives/cat_release_notes.html#000221
Thanks, fixed in CVS.