17. A method of adaptively updating at least one taxonomy that specifies at least one business service category and a list of keywords that represent a proposed best practices list of keywords for the at least one business service category for use in a search engine and/or online directory, the method comprising acts of: generating, using at least one processor, a plurality of online marketing campaigns for a plurality of businesses, using the proposed best practices list of keywords, so that each of the plurality of online marketing campaigns includes at least one keyword from the proposed best practices list and at least some of the plurality of online marketing campaigns include at least one new keyword; specifying a listing type for each of a plurality of keywords in the at least one taxonomy in the proposed best practices list of keywords, wherein the plurality of keywords includes a first keyword and a second keyword, wherein the listing type for the first keyword specifies that the first keyword is a search engine keyword to be purchased, wherein the listing type for the second keyword specifies that the second keyword is an online directory category in which to purchase a listing; adapting, using at least one processor, the at least one taxonomy based on a collective performance of the plurality of online marketing campaigns, wherein the performance of online marketing campaigns for at least one hundred businesses is evaluated in determining whether to adapt the taxonomy, and the adapting includes adding and/or removing at least one keyword from the at least one taxonomy; after generating the plurality of online marketing campaigns for the plurality of businesses, evaluating a performance of the at least one new keyword in the at least some of the plurality of online marketing campaigns that include the at least one new keyword; determining whether the at least one new keyword satisfies at least one performance criterion; updating the at least one taxonomy to add the at least one new keyword to the best practices list of keywords for the at least one business service category, so that at least one online marketing campaign may be based upon the at least one new keyword, when it is determined that the at least one new keyword satisfies the at least one performance criterion.
17. A method of adaptively updating at least one taxonomy that specifies at least one business service category and a list of keywords that represent a proposed best practices list of keywords for the at least one business service category for use in a search engine and/or online directory, the method comprising acts of: generating, using at least one processor, a plurality of online marketing campaigns for a plurality of businesses, using the proposed best practices list of keywords, so that each of the plurality of online marketing campaigns includes at least one keyword from the proposed best practices list and at least some of the plurality of online marketing campaigns include at least one new keyword; specifying a listing type for each of a plurality of keywords in the at least one taxonomy in the proposed best practices list of keywords, wherein the plurality of keywords includes a first keyword and a second keyword, wherein the listing type for the first keyword specifies that the first keyword is a search engine keyword to be purchased, wherein the listing type for the second keyword specifies that the second keyword is an online directory category in which to purchase a listing; adapting, using at least one processor, the at least one taxonomy based on a collective performance of the plurality of online marketing campaigns, wherein the performance of online marketing campaigns for at least one hundred businesses is evaluated in determining whether to adapt the taxonomy, and the adapting includes adding and/or removing at least one keyword from the at least one taxonomy; after generating the plurality of online marketing campaigns for the plurality of businesses, evaluating a performance of the at least one new keyword in the at least some of the plurality of online marketing campaigns that include the at least one new keyword; determining whether the at least one new keyword satisfies at least one performance criterion; updating the at least one taxonomy to add the at least one new keyword to the best practices list of keywords for the at least one business service category, so that at least one online marketing campaign may be based upon the at least one new keyword, when it is determined that the at least one new keyword satisfies the at least one performance criterion. 31. The method of claim 17 , wherein: the at least one business service category comprises a plurality of business service categories; and the taxonomy is organized hierarchically such that business service categories in the plurality of business service categories are grouped into one or more business segments.