I've written a small utility (in Scala) that can count the lines of code of a Scala project. It's not perfect, but it's intelligent enough (in most cases) to distinguish code lines from comment lines.

Download: ScCount-0.1.zip
Instructions: Give it some (or none, it defaults to ".") files or directories. Directories will be searched recursively, all Scala source files will be counted.

The distribution package is a bit rough. I haven't included the Scala library jar-file, because it seemed somewhat silly to ship some megabytes worth of library with such a tiny script.
I figure if you want this, you know how to start a Scala application from a jar anyway.