Image from WikipediaI work with eclipse all day, so I’ve spent some time messing around with plugins. Lots and lots of plugins.
The plugins I’ve current stablized on is:

Maven2 plugin: http://m2eclipse.codehaus.org/ (update-site: http://m2eclipse.sonatype.org/update/)
PMD for static analysis of java code: http://pmd.sourceforge.net/integrations.html#eclipse (update-site: http://pmd.sf.net/eclipse )
Findbugs for static analysis of java bytecode http://findbugs.sourceforge.net/manual/eclipse.html (update-site: http://findbugs.cs.umd.edu/eclipse/)
Checkstyle for doing code [...]