How does Maven depend on Plexus components?

plexus consists of a myriad of components

component	site	repo	latest version	comments
`plexus-utils`	site	repo	2.0.5@svn 2.0.7@github	extensively used in core, every plugin, Modello and generated code, ... Proposal : Plexus-utils replacement
`plexus-classworlds`	site	repo	2.2.3@svn 2.4@github	used in Maven core.
`plexus-containers`	site		1.5.5	replaced in Maven 3 by guice + sisu + sisu-plexus
`plexus-container-default`	site	repo		replaced in Maven 3 by sisu-inject-plexus
`plexus-component-metadata`	site	repo		still used in Maven 3
`plexus-component-annotations`	site	repo		still used in Maven 3
`plexus-component-javadoc`	site	repo
`plexus-components`	site
`plexus-archiver`	site	repo	1.2
`plexus-cli`	site	repo	1.5
`plexus-compiler`	site	repo	1.8.1	used in maven-compiler-plugin
`plexus-digest`	site	repo	1.1
`plexus-i18n`	site	repo	1.0-beta-10
`plexus-interactivity`	site	repo	1.0-alpha-6	used in wagon-ssh (then Maven core), maven-archetype-plugin, maven-release-plugin
`plexus-interpolation`	site	repo	1.14	used in maven-resources-plugin
`plexus-io`	site	repo	1.0.1
`plexus-resources`	site	repo	1.0-alpha-7
`plexus-swizzle`	site		1.0-alpha-1-SNAPSHOT
`plexus-velocity`	site	repo	1.1.8

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