Here's the style of pin nocks that I've gravitated to over the last year. You just shape the bow's tip into a point, and cut the nock across the back 0.5-0.75 inches from the tip. Here's what this style of nock looks like on the osage shortie (40 inches nock-2-nock) that I'm hunting with this year:
(http://path2resilience.files.wordpress.com/2011/10/pin-nocks1.jpg)
When I first tried this I was admittedly scared, as you're violating the outer growth ring and common knowledge says never to do this. I've used this style of nock on osage orange, white ash, hickory and white oak and have never had them fail, so I've decided that violating the outer growth ring is fine as long as the bow isn't bending within a few inches of the violation. Since most of us don't tiller our bows to bend at their tips, using this style of nock doesn't seem to reduce the bow's durability.
Also, you won't find a nock style that allows for lighter tips, and lighter tips means less hand shock, a quieter send-off for the arrow and more arrow speed. Since your nock is a valley across the back of the bow, the string can never slip off even if your string angle exceeds 90 degrees. Since I started experimenting with this style I've come to like it a lot, and I suspect I'll use it for most of my bows from here on.