Yeah, i've already closed all the test* projects, as well as the *scala* which brings lots of compile issues. After having closed all those, there were no more issues.
The Scala scripting modules should build fine with Maven. There is one integration test for the Scala scripting engine which fails (org.apache.sling.launchpad.webapp.integrationtest.scala.testIgnore). This is a know issue.
For importing the Scala modules into Eclipse you need to have the Scala plugin installed [1]. However, IDE support is somewhat shaky and the modules might no compile before fixing the project setup manually.
Michael [1] http://www.scala-lang.org/node/94
