I found a few tour companies for Rome.

Context Travel http://rome.contexttravel.com/cart/tours.php Here's a review: http://tinyurl.com/zqr3x

Angel Tours Rome http://www.angeltoursrome.com/en/index.html Review: http://tinyurl.com/ooseg

There are others I found: http://tinyurl.com/r63br

Romaround: http://www.romaround.it/

Be sure to see the Pantheon when in Rome!

Frances Toronto, Canada