I feel your pain! My now 7 1/2 year old was a terrible sleeper. When all the basic advice fails (white noise, consistent routine, etc.), try to remember that you and your child may need a different system. No book can be perfect for every family. Trust your own instincts about what is right for your family. It sounds like you're already doing all the right things (lots of excercise, healthy food, minimal TV, etc.).
That said...I started giving my daughter a tatoo in the morning if she left me alone all night when she was about 3 years old. That improved things for me, but she was still often up for hours in the night (I'd see elaborate block and animal set-ups that had not been there at bedtime). White noise helped some, a high-protein snack at bedtime helped some. She didn't nap at all after her 3rd birthday. We did quiet time for an hour after lunch in her room. I set a kitchen timer, and she could come out when it dinged. If she came out early, I added minutes.
When I finally discovered Cranio-Sacral massage therapy, I was so sad I had not heard of it earlier. She was 5 1/2 when we first tried it, but I have since taken both my younger children (one at just 4 days old - it is totally safe). She slept soundly all night for the first time in a long long time the night after her first massage. If this is the magic bullet for your kid, you'll know the first day. It can't hurt; it might help a lot. www.kenpiercy.com This is the therapist we use. It's extremely gentle, the kids lay on a massage table or a big swing and play with toys during the massage. I used to stay and read stories to her during the massage also. My daughter now goes quarterly, and we're all so much happier when she sleeps better.
I also knew a family with a very similar baby/toddler who swore by some kind of magnetic pad they put under the baby's mattress. They said that was amazing, and she started sleeping much longer and more soundly immediately. Sorry I can't give you more specific information on that one.
"Raising Your Spiritied Child" is another great book to try.
Hang in there, and don't give up. Some kids are more challenging than others, and sleep deprivation is serious for both you and your child.
S.
(mom of 3: ages 7, 5 and 1)