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FYI, I've tried a few calendar modules, but I just installed piCal and am very pleased with it (make sure you get the most recent version from their website).
As for clock; your best bet is to find a stand-alone clock and add it wherever you want on your page (either block or inside a page template). I recommend a flash one for the sake of performance and style (javascript is just clunky).
Cheers,
Keith