It is better to have each page with different keywords and descriptions so that you can get listed under search engines with different keywords. If you use the key word google for example...its a long shot you will get traffic from a search engine. If you are using 100's of keywords with the word google, like google adsense, you will more likely get traffic as you are covering more keywords. I know I didn't word this to great, but I was in a hurry and figured I would try to help
