Here's a Feldberg lesson, if you're into that sort of thing.
http://www.vimeo.com/19847946
It all comes down to practice, really. I always sucked at putting and never spent quite enough time practicing it because I really did not know what I was doing. I kept switching it up. Last winter I figured enough was enough and I brought the basket inside my apartment and decided to start from scratch. I first paced off about 20 feet and tried different ways of getting the disc in the basket that required LEAST EFFORT. Once I found what took least effort on my part to get the disc in the basket, I started tweaking that stroke to improve consistency. That's how I finally found my putting stroke. Everyone has their own style, and it's all a matter of comfort.
A buddy sent me this Feldberg video about a month ago and I was surprised to find that a lot of my putting form is actually very similar to his. I always thought Feldberg's putting was goofy looking until I saw this video, and now I realize that our mechanics are a lot alike. I'm guessing everyone that push putts has the same basic mechanics that are described in this video, but the reason everyone's style looks so different is because that's what they are comfortable with. So again, find a stroke that is comfortable for you then use the tips from this video to identify different parts of your stroke so you can really iron out your putt.
Don't forget that putting inside the circle is mostly mental. When you're practicing putting then by all means think all you want about your mechanics, weight transfer, etc. When you're actually playing all you should be doing is clearing your mind, picking your target, and throwing your putt. Assuming you spent the adequate time practicing, your body knows what to do to get the disc in the basket. Introducing thoughts about mechanics only increases the chances of you missing because you give your brain other things to think about other than just "get this disc in that basket". This is a reason some people feel they are higher percentage from 30 feet and out. At that distance they figure they are probably not going to get it in the basket, so they don't think about anything - they just aim their putt, maybe visualize the line, and throw. They don't think about mechanics. They just putt. And the end result is they're pretty damn accurate most of the time. The same people then get inside the circle and really over-think everything. They start thinking about the wind, the mechanics of their stroke, their stance, their balance, everything but getting the disc in the basket. And they miss the putt. Again, save all those thoughts for when you practice. When you actually play you should trust your stroke and just clear your head and focus on the basket. Zone in on that chain link. Then throw your putt. Don't think about any mechanics of your stroke. Just trust it. Don't think about that last putt that you missed low or left. Just think about getting the disc in the basket. And throw it there.