scm tasks able to use tags?

Hi there folks,

I have not used capistrano yet, but with some rails deployments coming
up I figured I should see what all the great buzz is about.

Reading through the documentation, I see where scm repositories are
specified and used, but no mention about tags/branches.  Does anyone
know if capistrano can use branch or tag names when checking out code
from a repository, rather than just head?

Ideally, I'd love to see the branch/tag name used in the naming of
subdirectories of the "releases" directory that capistrano manages, so
we're able to tell what "version" of code was used for a particular
release.  Ensuring each release is built from a known label (branch or
tag, of which i prefer tags) solves for lots of troubleshooting issues
and makes the process that much more reliable and repeatable.

cheers,
b