Right now the only way to check a build in Hudson and see if it has been tagged
is to open the console output, scroll all the way down to the bottom of the page
and look for "Tag Base URL:"

If possible it would be helpful if this information was displayed on the build
summary page, similar to the way the findbugs and checkstyle plugins do.

That way you'd have one place to look, it would show you the Revisions the build
was created from, show the build artifacts, the changes, the other plugin
information, and finally what tag(s) have been created for the source code of
the build.