Relationships Search other than via Advanced Search?
I just had a go on Demo

"This smart group will stay up-to-date with all contacts who meet the search criteria.

Employee of

Relationship - Active and Current"

I don't know if it will still be there by the time you get to look at it. http://d46.demo.civicrm.org/civicrm/contact/search/advanced?reset=1&amp;force=1&amp;ssID=1