I did one here in Kansas City called Ghosts and Gangsters and enjoyed it for the most part.Unfortunately many of the places on the tour are still operating private businesses or private residences so contact was often limited to the sidewalk or drive by stories.

I recently received a Groupon invite stating that the production company that stages the tours will also be doing a ghost hunting tour. That would be very cool if it is hands on experience.

The Pike Place Market here in Seattle has a ghost tour that is pretty popular, and supposedly good. But I haven't been on it yet. I have been on the Underground Tour a couple of times, and the tour guide makes all the difference.

We wanted to do the Providence Ghost Tour but ran out of time.. too much to do, not enough time! We did see the TAPS office in Warwick, RI though :)

Which ones did you do? There's a fun one in Old Town Alexandria that they only do in October..I enjoyed it.

Haven't done that one, but would like to at some point. I've done the Old Town Trolley and the Greyline (?) tours. They were boring, but the monuments are beautiful at night!