To those of you who responded to my last post, thank you. Howerver, I am now considering buying a 15" powerbook, since my budget will allow me to, barely. My question is now, were I to get the 1.25 ghz version, how much does the higher processor speed affect the battery life? I know that the 15", in general, has a low battery life, but will the extra processor speed really reduce the time by a full hour, or will it only be a matter of minutes? Thank you!