Deleting unused modules and deprecated versions of modules
Installation and Configuration
As for the old modules, there's a setting at CORE -> MARKETPLACE -> GLOBAL CONFIG -> MARKETPLACE VERSIONS of how many to keep around.
If you want to blow away everything and just keep the most current version there's a tool at DEVELOPER -> DEVELOPER TOOLS -> REBASE MODULES
That takes all the -version-2.2.2 and reverts it back to just its module name and deletes the other versions.
The first method is safer and recommended for production. The second method is useful for when you're trying to figure out the difference between files on the server vs local copies. Its hard to 'compare' files in different directories.