Any one have a good idea why my keyword moves up, and then goes down a little bit, or sometimes completely disappears, my though is that google is re indexing the url for that certain keyword, this keyword is getting over 14k search per day, well thats just a estimate, but its on the 3rd-5th page, and I'm wondering if its going to get really hard to get it up on the 1st page once i start getting up around the 2nd page?

I could be the site getting adjusted in all the different google data centers. Check it out on this link http://www.void.be/googletool.html
It will probable settle down soon.