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Hit them up with good and solid keywords (don't overdo it), but having them in the <title> tags is more important, plus having them in different formats (links, headers, bold, italicized, underlined, etc..) plus proper usage will go much further than having them in the meta tags.
So, repetition with keywords throughout the title tag, keyword content, headers is a good thing, I gather?
What about logo/banner jpgs. I have one in my header. Should they be named "banner.jpg" for instance or should they be named something page related like "mypage.jpg"?