What to do with front extra expansion bays?

Solution
A fan controller is a decent idea, you could also get one of those LCD temperature displays too. I have two DVD drives (one DVD-R and one BD-R), and a 5.25" card reader.

StigOfTheTrack

Honorable
Jul 19, 2013
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Drawer. Won't hold much, but can be handy for USB sticks, memory cards and similar. Has the advantage of not using any power :)

There are various designs around, do a google search and find one that matches your case.