Hi y'all

I'd like to pick your brains a little...

I was thinking about the SERPS (Search Engine Result Pages) and was wondering what in your opinion is the most clicked position on a 10 item result page? What is the order of importance thereafter? Linear, reverse, mixed, chaotic?

Is it 1, 2, 3....10?
or 1, 3, 5, 7, 9...?
or 1,2,3,10,9,4,5,6,7,8?

And what do you think is the order of most valuable positions on page 2?