Depends on how intense the queries are. If they're trivial then don't worry about it, if they're not then you could cache the output for the whole page with ob_start and ob_get_clean, or you could serialise result set arrays and write that out to a file then read it back. Serialised data transforms back blisteringly quick, too - it's faster than including the same array in a php file.
Always use ob_start at the top of php pages that have loads of output, too. It can really improve page load times after they hit a certain size. See the output buffering functions for more info.
