My hands float around and don't really have any rules except left hand for left side and right hand for right side, where the sides are loosely defined. Some keys I may hit with one finger just to hit it with a different finger on the other hand the next word. I don't really know how I do it, I guess it's all about using whatever finger is closest and my hands float around so that the closest finger isn't always the same. I don't need the ridges on the keys, if I can find the space bar I can find every key. I also rarely use my right pinky finger except to hit Enter, it's usually too slow for anything else. I learned to type playing PK MUD games and I was up to 130-140 WPM. Nowadays I don't play MUD games very much and I'm usually around 110 WPM when I check. Also, I need a specific layout or else I'll miss a lot. Laptops don't generally have the layout I need and I'm very bad on them.