As much as Maven makes it easy to deal with builds, the plethora of XML and the varying life cycles phases can sometimes make it hard to figure out what a build will actually do.
To help with this, I'm happy to make available the Eclipse plugin called the "Maven Inspector". This plugin provides a simple View called "Maven Execution" that presents for a given POM file the phases and associated MOJOs.
Go check it out on http://prapicault.github.com/MavenInspector/ or directly install it from http://prapicault.github.com/MavenInspector/repository
Enjoy!