18. The computer-readable medium of claim 17, wherein said sorted list includes a most relevant document having an absolute relevance score higher than said absolute relevance scores of all other training documents in said sorted list and a least relevant document having an absolute relevance score lower than said absolute relevance scores of all other training documents in said sorted list, and wherein said step of performing a binary search comprises the step of comparing said absolute relevance score of said newly-received document with a statistical average of said absolute relevance scores of said most relevant document and said least relevant document.
19. The computer-readable medium of claim 18, wherein said instructions for executing said comparing step comprise instructions for executing the step of comparing said absolute relevance score of said newly-received document with an absolute relevance score proximate to said statistical average of said absolute relevance scores of said most relevant document and said least relevant document.