I've connected with them on a few occasions.
The first time I connected with one was when I received an image of a falcon while I was trying to meditate on Bell Rock near Sedona, Arizona. It was a clear picture of the mountain in front of me with a falcon hovering close by.
The falcon was confirmed when I had a hypnotherapy session suited towards spirit guides a couple of days later. During the middle of it I had a second guide take over that sounded like the voice in my head that I had been carrying around for a while.
I also have a rather imposing Native American spirit guide when he showed up in a reading done in Feburary. I think I've felt him call on the trip to Sedona, but that was more of a "big tap on the shoulder" and a very intuitive voice. Apparently I get to meet him and get his name "when I'm ready".
I had a reading from Erin in August 2006 and nothing of this sort came up - then again, I believe I wasn't ready for this kind of conversation. I was a different person then and I was looking for a different direction than what I am getting now.
If you asked me eight months ago about this, I'd never believe you for an instant. Now I'm convinced that people have guides and something is out beyond the physical space.