I tell my T about my dreams fairly often, and I do find it helpful. Sometimes she has good insights, sometimes it's just a way to convey to her things I'm thinking about, that I don't want to or can't talk about directly.

I've never talked to her about a dream about her, though I think I did have one once (anxiety related, missing session times, etc.). I did have another dream once about being lost in a hallway, and she had an interesting interpretation that it was about her since she had just moved offices. So yeah, I think it's a good therapy topic. Also, one time, when I was upset about something, she told me that she had had a dream about me! I still kick myself for not asking more details about it...I think she was just trying to tell me that she thought about me outside of sessions.