We have used neurofeedback (*not* biofeedback) VERY successfully for my bipolar, PG dd19. In fact, she is going to return for additional sessions this summer once her college ends for the year, along with EMDR (Eye Movement Desensitization and Reprocessing) given that she has had some traumatic events since she had neurofeedback (including the death of her father, so we're talking major trauma). We've read very positive results for this with ADHD, more so than with bipolar even. And, my little scientist (dd19 is entering her senior year of college as a bio major with a special interest in genetic research) is pretty critical of these things. It's actually weird that she is the patient, but also loves to research these things (she was just talking to me today about the GABA connection between her bipolar and her deceased father's epilepsy :))...
Anyway, I am very surprised by the poster who said her friend going into neurofeedback couldn't find a lot of data to support its success, because we found quite a bit before we did it. Anyway, I'm sure everyone's experience is different and I'm not a researcher and can't turn a critical eye to these things, but I definitely think it's worth a try!
Theresa