I really like Gary Evan's approach to the Law of Attraction. Here's a free ebook of his to get a feel for his style / approach:
http://www.Manifest-Miracle.com
He also has a full program with ebook, videos, workbooks, etc, which is quite good. I really enjoy his blog also:
Good To Feel Good Blog
My personal opinion is that everybody seems to have a piece of the puzzle... but because there's so much stuff deep down in our unconscious that also affects the Law of Attraction, it's VERY difficult, if not impossible, to identify a single approach that works.
My recommendation is to check out a few different LOA approaches and find the fit that works.
However, most LOA practitioners do seem to agree that intention + ACTION + positive thinking seems to be the basic key. The rest seems to be just personal preference.