I noticed that 3.1.0's tag in svn is http://svn.apache.org/repos/asf/lucene/dev/tags/lucene_solr_3_1. Should it not be http://svn.apache.org/repos/asf/lucene/dev/tags/lucene_solr_3_1_0? At least, that's what's specified under "Publishing" on ReleaseTodo wiki.
Also, the common-build.xml under the tag and the downloaded sources specifies version to be 3.1-SNAPSHOT. On the ReleaseTodo I found this: "... and the default version in lucene/common-build.xml on the branch to X.Y (remove the -SNAPSHOT suffix)", so I guess 'SNAPSHOT' should have been removed, but also version should be set to 3.1.0.
I apologize for finding these *after* the release has been created. I don't think it's critical that we fix the common-build.xml, but perhaps update the ReleaseTodo accordingly, so we do it right on 3.2? Can we rename the tag? Is it critical?