I haven't actually seen The Secret, but I think I understand the concept and I have a story.
Last January some friends and I talked about this stuff and we all decided to write a list of what we want the most and can visualize to 'send it out into the universe'. I wrote down maybe 15 things, some small but one huge one. I wrote, "I want a one family house in this neighborhood or one like it, with a sunnier yard, near the lake, near parks, on the bus route." At the time we were living in an old two family house with a very shady yard.
I had completely forgotten about the list, it was on my livejournal, until I was reading back through the archives the other day and I found it. In August we bought a house and the new house fits the description on my list in EVERY way. Every little detail! I wrote "near parks", and there is a park right outside our front door, another one street over and another 5 streets over! Our yard and house is so sunny and bright and we are in roughly the same neighborhood. I am near the lake, it's only 5 houses to the north and there's a park on the shore.
I truly believe this house came to us because I was able to visualize it in such detail.
Pretty much everything on the list was stuff we had gotten in the last year, the only stuff that we didn't get was stuff I no longer want and healthy skin. I will be working on the healthy skin this year!