I am looking for a utility (or the like) that will enable me to accomplish the
following:

1. Determine which Content Types are being used anywhere within the site
collection and which ones are not, with the intention of deleting all unused
content types.

2. Determine which Features are being used anywhere within the site collection
and which ones are not, with the intention of deleting all unused Features.

3. Determine which Features are missing or obsolete (causing errors in
_layouts/wrkmng.aspx), with the intention of uninstalling these Features.

4. Any other useful 'cleanup' type work.

Bottom line, I am looking to remove all unused and unnecessary artifacts from
our system to streamline it and trim it down to only those that need to be
there. Hope that makes sense ...

Any help or information on where I can go to obtain a utility that would aid in
accomplishing this would be appreciated!