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SERPs depend on several factors, not only from amount of backlinks.
Other factors include the anchor text of your backlinks, the strength of those backlinks (dofollow & PR of linking pages, amount of outgoing links on those pages, the place of your link in those pages,...), the SE optimization of your own page,...
And, as stated in previous answers, also the same factors for your competitors (including optimization of their own pages).
Changes may also come from google: either temporarily (you got SERPs from another data center) or not (real change of algorithm).
Last edited by jose; 02-26-2010 at 08:30 PM..
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