OSGi manifest entries should be added to the jars (such as scala-library) so they may be used as OSGi bundles.
The ScalaIDE project distributes an OSGi bundle, but it isn't ideal for all use cases. For example, it only appears to be available from p2 repositories, which makes it difficult to use in projects unrelated to Eclipse. It also contains all the scala jars, which adds significant footprint.
Assigning to Josh at his request.