I've got a couple of NatalHypnotherapy CDs that you can get in the NCT catalogue (got mine off e-bay). Quite nice and not too hippyish. Relaxing and Positive.
I've also got Marie Mongan's Hypnobirth book. Sadly there's no CD in it - but it does have scripts so you (or your other half) can record your own tracks that suit you personally - an especially useful thing to do if you or your partner find some of the visualisations a bit cringey. (Plus it'll save you £20 a CD!!!) DH and I are literalists but are both aware that I respond well to suggestion so are going to give it a go for labour.
For instance, I react more to the mindful interaction of body/mind - so when the book describes what happens to your womb muscles in a contraction, I think I can probably use that info during labour to focus me and help me to detach. Plus DH won't feel as daft trying to tell me that my cervix is like a opening rosebud, mid contraction!!
The book has also got a good list of positive affirmations that are worth a daily reading or photocopying to give to your birth partner to say to you for when they get bored of saying "breathe" and "well done" and "you can do it" in as many different ways as they can after 30hrs.
There's a list of terms thrown about in labour with a positive spin translation. e.g. instead of having a false labour and thus feeling daft when the hospital sends you home, it suggests you see it as having a practice labour and actually be pleased with yourself that you coped and used the time to practice your breathing etc. Again, for someone like me who takes things to heart too much, to have this alternative approach which essentially says the same thing, would be very useful and affirming
The book also describes a "programming" technique - much like you see Paul McKenna use. It gets you to associate things like being calm with placing a hand on your bump. Or subliminally reminding you of your breathing technique when your partner touches your upper arm. Hopefully more acceptable than someone saying "Calm down" and me bellowing back "I AM CALM" - which is my usual reaction to such obvious, idiotic suggestions.
My Psychotherapist friend recommends writing down all the things that you think would be useful to you and forgetting about the rest. Same with the CDs - edit out the bits of tracks that aren't useful to you.
However - for it to work, you do need to work it. Probably a couple of months of practice a couple of times a week.
All in all - the NatalHypnotherapy CDs are generally good as a readymade one size fits all approach - but if you want something more specifically good for you, get the book or pay the £300 to go on a course to get the Rainbow CD etc. Book is cheaper and more than adequate IMO.