You can find older releases at our codehaus distribution repository: http://dist.codehaus.org/gradle
Choose the build you are interested in from the list of
completed builds.
Then click the Artifacts
tab and then the dists
link. This will give you a list of the different distributions produced
by this build.
For special snapshots (for example created from a working copy) we use our codehaus snapshot repository: http://snapshots.dist.codehaus.org/gradle