This was to get to a post-1.3.3 Buildr to setup a Scala/Java project structure, as Buildr supports Scala compilation, plus I gather there's lots of good stuff on trunk. I still had to add require "buildr/scala" to the buildfile. As much as I prefer Buildr/Ivy for bootstrapping a project over Maven2, I wonder about needing a cross-language dependency chain (or gems) like this for doing Java/JVM stuff (such as having to install easy_install to get a gem set). Having never used it in a production/industrial setting it's hard to say. Otherwise, I do like Buildr.