I haven’t done any iPhone version yet, so I have this question,
In order to be able to browse the website properly -even if the user turns 90º his phone:

Shall i CSS set with’s in px or in % ?
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If you are programatically targeting the iOS devices such as the iPhone & iTouch then i would use pixels opposed to percentages, but if you are not targeting such devices and want a one stop mobile website for all (most smart-phones) then i would consider using percentages.
you can specificy
min-width max-width and min-device-width and max-device-widthin your media queries.Here is a little more about media queries and the combinations that you can do;