Interpolation search works better than Binary Search for a sorted and uniformly distributed array.
On average the interpolation search makes about log(log(n)) comparisons (if the elements are uniformly distributed), where n is the number of elements to be searched. In the worst case (for instance where the numerical values of the keys increase exponentially) it can make up to O(n) comparisons.
Sources:
http://en.wikipedia.org/wiki/Interpolation_search
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