Just added the ContactSegment extension to the extensions directory. It has been created for a specific problem but we tried to keep the base generic. The development was done by CiviCooP and funded by PUM Senior Experts for CiviCRM 4.4.
The extension adds a segmentation to the contact summary and allows flexible set up so you can have your own labels for the parent and child segment. Check the extension page for more details: https://civicrm.org/extensions/contact-segment