If you maintain a thick layer of newspaper clippings on the top, it really halps cut down on fruit flies. It also helps if you cook the stuff first (just put it in the microwave for a bit.
I got my bin from Happy D Ranch, this was the only model they had at the time but it looks like they have a few other models now: http://store.happydranch.com/Worm_Factory_p/wf.htm Their worm bins have a spigot at the bottom to drain off excess liquids.
That setup wouldnt work in my college dorm. I learned that lesson the hard way. After all the fruit flies I know use a layer of newspapers