Copy SharePoint content types & columns

It seem that there are a few tools out there to handle the modification and copying of content types and columns within MOSS

I have a list of a few options listed here:

• My Favorite tool of the month http://sushi.codeplex.com/
• stsadm command line add on (this is also one I have used and it rocks, it also has many more extent ions. It need a bit of config but is worth it) http://stsadm.blogspot.com/2007/08/copy-content-types.html
• The quick and nasty content types and columns between sites http://www.sharepointblogs.com/koning53/archive/2008/06/11/synchronize-content-types-and-site-columns-between-teamsites.aspx
• Move site columns between site collections http://www.codeplex.com/spSchemaMigrator

Possibly paid for products:

• http://www.schemalogic.com/
• http://www.metavistech.com/classifier

Hope this helps