We(three couples traveling together)were fortunate to have booked a tour with Francesca Caruso (chris.fra@mclink.it) to see the Forum and the Coliseum. It was an absolutely wonderful experience, as she is extremely knowledgeable and thoughtful, and made our tour one of the highlights of the trip. Surely, one of the best tours we have ever had.

Judith, too funny, I'm just now reading a trip report by Kristina where she mentions using the same guide. How did you find her? Does she have a website?

Yes, she's excellent and you can read about her in my trip report (assuming it gets posted here given its epic length) or on my website (link below).
She does not have her own website, but she is mentioned in Rick Steves' guidebooks as he uses her on some of his tours in Rome.
I found her on the Fodor's message board- she come highly recommended there.

Kristina, believe me, I've read longer. It should be posted later today or tomorrow.

And now, she comes highly recommended here too.