Been doing a search for one myself. I've know people who have done it and it works. I even talked to my chiropractor about it. You have to remember, nothing is guaranteed just like an alopathic (sp) doctor can't guarantee anything. Do your homework for the best practioner and go for it.

There's a youtube for everything it seems

www.youtube.com/watch

It makes sense to me that bodyworkers would be able to release these pressures or tensions by massaging the cranium in certain ways too

I recommend it often to mamas who's babies aren't latching well/nursing issues. I have seen it work miracles on babes. I had it done to my newborn a few times to help with nursing problems and it helped a lot.

I think with anything, the consumer needs to look around and find out who works well and has recommendations from others. I wouldn't just go to anyone, even if they are certified in it.

I think it works for those in believe in it, and nay for those who don't.

If the Cranial Sacral Therapy doesn't work then perhaps Cranial Stick Therapy would.
It produces an immunity to whatever New Age HooDoo de Jour that might be lurking amidst the cranium dust!

As a bodyworker/massage therapist/instructor; I highly recommend it for some conditions/problems.
Does it do what is claimed? Well, it depends on who says what. Some folks over-step their bounds and say CST can do all sorts of things. When in fact, many conditions are psychosomatic (no, I don't mean imaginary) and belief can play a huge part in a persons healing/recovery.
To the work itself. I'll explain it this way:
The body (all tissues/organs/bone) are wrapped in another tissue called fascia. The fascial system is one continuous piece of fabric inside the body. This fabric attaches to the inside of the human skull as the meningeal membrane system. The hydrolic system of the cerebral spinal fluid is palpable to a skilled practitioner (yes, it is minute). Using the ebb and flow of the csf one can traction/mobilize the plates of the skull, sacrum, spine, fascial bands/diaphragms, and limbs. The fascia is a structural system that holds things in their place. Fascia resists force. Fascia cannot resist the two extremes of force; very light/very deep.
Deep work (Structural integration/ Rolfing, etc), causes the fascia to undergo thixotrophy. Turning it from a solid to a gelatinous substance (temporarily). This will give the fascia length, thus lengthening segments in the body.
I look at light work as counter balance of gravity. Five grams of pressure is used. Under this small amount of pressure the body (bones, limbs) "unwind". This unwinding is much like what happens when you let go after twisting a piece of plastic wrap.
Because fascia can bind, stick, twist or have other abnormalities, it can communicate dysfunction throughout the body (remember, it is only one piece of fabric), like pulling on one strand of a spiderweb.
And on one of the links up above; it sucked. Doctors have a tendency to fail in their understanding of the human form. Medical schools do not teach manual therapies (or electrical or herbal medicine for that matter). Doctors are limited to pharmaceutical and surgical approaches to the body. Mind and body are still seen as separate and are divided into two types of schooling.
I recommend CST work for many of my clients who suffer from many conditions from headaches to nerve impingement even mental/emotional issues. But I also recommend, structural integration, neuro-muscular therapy, acupressure/puncture, trigger point therapy, or even a relaxing massage. It depends on what works best.
And finally, I agree with some of the above posts. You need not believe that something will work for it to. If you do, it may help. But if you don't believe it will, it probably won't.