I moved out at 20, this summer actually. I had to for the same reason as Laura, although my uni's only 70kms away from my parents house (well hey that's a long way for Dutch standards :P). But I didn't feel like commuting any longer... If I'd chosen to go to uni in Amsterdam, where my parents live, I probably still lived in with them. Finding a place in Amsterdam is pretty much impossible.

I live in a student house now and we pretty much share all the costs, which makes it less expensive. It's not too bad and I have the luck of a very cheap room (while it's still fairly big and clean) compared to most of the people I know.