How much would I be charged if I select five phrases of keywords? My add is supposed to be displayed whenever any of these keyword phrases are found in content network or search network of Google. Am I charged as a whole sum of the five different price figures or the average of all the five (12/19/2008)?

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Google AdWords changes your actual CPC/CPM dynamically. Google will not charge over your specific max CPC or max CPM. They employ a technology called the AdWords Discounter which monitors your competition and automatically reduces your actual cost-per-click. So you pay the lowest price possible for your ad's position on the page. After each auction is run and your ad is ranked, the AdWords Discounter adjusts your actual CPC. Payment is the minimum amount required to exceed the rank of the next highest ad.