The gradle-1.6-all.zip looks like it contains 3 duplicate copies of
gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction.
or at least unzip complains like this:
replace gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction? [y]es, [n]o, [A]ll, [N]one, [r]ename:
replace gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction? [y]es, [n]o, [A]ll, [N]one, [r]ename:
replace gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction? [y]es, [n]o, [A]ll, [N]one, [r]ename:
Doubt this really effects anything as it is in src/META_INF, but doesn’t give prospective users a warm and fuzzy feeling if gradle has trouble cleanly creating a zip of itself. Bad tasting dog food! 
Philip
Thanks for letting us know. The duplication in the zip is the (correct) result of merging the source trees of all Gradle subprojects. Looks like we’ll have to find a better way to organize sources in the distribution.
<br /> $ unzip -t gradle-1.6-all.zip | grep ProjectConfigureAction <br />
testing: gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction
OK <br />
testing: gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction
OK <br />
testing: gradle-1.6/src/org/gradle/configuration/ProjectConfigureAction.java
OK <br />
testing: gradle-1.6/src/org/gradle/configuration/PluginsProjectConfigureActions.java
OK <br />
testing: gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction
OK <br />
testing: gradle-1.6/src/META-INF/services/org.gradle.configuration.ProjectConfigureAction
OK <br />
This reply was created from a merged topic originally titled gradle-1.6-all.zip contains duplicate named files.
Just in case others see this, this issue still exists in 1.8-rc1 and is a known bug, GRADLE-2767
inflating: gradle-1.8-rc-1/src/org/gradle/api/plugins/buildcomparison/gradle/internal/ComparableGradleBuildExecuter.java
replace gradle-1.8-rc-1/src/META-INF/services/org.gradle.configuration.project.ProjectConfigureAction? [y]es, [n]o, [A]ll, [N]one, [r]ename:
inflating: gradle-1.8-rc-1/src/org/gradle/nativecode/base/plugins/package-info.java
replace gradle-1.8-rc-1/src/META-INF/services/org.gradle.configuration.project.ProjectConfigureAction? [y]es, [n]o, [A]ll, [N]one, [r]ename:
inflating: gradle-1.8-rc-1/src/org/gradle/plugins/ear/descriptor/internal/DefaultEarModule.groovy
replace gradle-1.8-rc-1/src/META-INF/services/org.gradle.configuration.project.ProjectConfigureAction? [y]es, [n]o, [A]ll, [N]one, [r]ename: