The only thing I can tell you is to get some slick tires and if you can lock out your suspension do it. That would be about all you can do to turn it into a "commuter" bike. As far as really being a road bike the geometry is all wrong. If you spent the money to change our the rear cluster, add drop bars and change out your shifters and brake levers you still would have a very heavy bike plus the amount it would cost could by you a nice entry level road bike.
Or if you want to do some decent mountain biking (what I would do) here are some sites that might help:
Midwest Mountain Biking
Mountain Bike Review - Iowa