We have a 13-month-old boy and another on the way in February. I read in several places (like the book "Baby 411") that sippy cups increase a child's chances of childhood tooth decay because they direct liquids to the base of the child's front teeth. Also that sippy cups are very convenient for us adults because they result in less liquid mess, but they don't teach a child how to drink from a regular cup because they have to suck in order to get a good flow of liquid.
While my nephews use sippy cups, and while I don't think other parents are "bad" for giving them to their kids, we personally chose to wean our kid from a bottle directly to regular household plastic cups. He sometimes gets water or milk dribbles down his front, but really within a month (yes, the past month) he's figured out how to control the flow of liquid and how to stop drinking without getting liquid all down his front, and I think that knowledge will make it easier for him when he moves to holding the cup all by himself.
You could also try looking into clear sippy cups, or valveless ones. The First Years makes colorful "take and toss" cups that are dishwasher safe and come either with sippy lids or straw-hole lids. We just use the cups. They're very sturdy and attractive, and I think it helps our son to see the liquid through the cup. But he also does well with solid plastic cups.