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pageoneresults - 3:56 pm on May 21, 2006 (gmt 0)
It sounds as though you are chasing one or two terms. What about all the other terms? What about the long tail of search? It's somewhat rare these days for a competitive site to hold the #1 position for any length of time. Those that do most likely have an aging factor involved. I've seen a few pages hold in that #1 spot for quite some time. But, every now and then, they shift to #2 or #3. It's no big deal. Eventually I see them back in the #1 position. It's all part of the natural process. With Google, you'll most likely see this more frequently than with the other two majors. Google's index is in constant flux.
Just before one of the updates in 2005 I was at #2 for a couple of months.