Major Description
http://www.scala-lang.org/node/94
As detailed by the above link, .classpath and .project files must correspond with a slightly different template in the latest version of the Scala Eclipse plugin. Generating project metadata according to the old form leads to extremely strange behavior in the plugin, making Buildr essentially unusable in conjunction with SDT. I would mark this as "blocker", but I doubt it affects many other people. 