well ive seen strap on 92mm coolers that sit atop the hdd, Thermaltake Hardcano front coolers (i think they are called) that use titchy 40mm fans or a whole slot dedicated to a cooler, a bigger version of the PCI slot coolers.
<font color=red><b><i>"Humans are just overclocked Monkeys!"</i></b></font color=red>
<b>Serving THGC for over 2 years.</b>
You have a lot of options, including removable racks with built in fans, removable racks with nothing more than vents, front panel covers with 40mm fans, etc.
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