Major Description
I believe there is a bug in dependency:list. The output format is:
<groupId>:<artifactId>:<packaging>:<version>
Most of the other goals, like get and copy expect the artifact coordinates to be of the form:
<groupId>:<artifactId>:<version>:<packaging>
This means you cannot easily write a script to use the output of list to resolve artifacts with get or copy and -Dartifact=...
I believe this is probably a bug in the output of list, but if anybody is relying on it, it might be better to add a new goal which fixes it by default, and has an option to specify the output format.