5 1/4 bay uses

Im doing a build and only one of the four 5 1/4 bays will be used by a cd/dvd burner and ideas for what i can use the rest of the bays for? i already have an sd card reader and fan controller on the case

http://www.amazon.com/desktop-computer-companion-accessories-Cosmos/dp/B006VAD2C6/ref=sr_1_1?s=pc&ie=UTF8&qid=1364153511&sr=1-1&keywords=drawer

You can use it for a resorvior for watercooling.

these are great

thx guys im gunna buy 3 of these