I moved in with my then-boyfriend after we'd been dating for only 4 months. We got engaged 8 months later and are getting married a little over a year later (eek, it's only 2 months away!)

I don't know... it's different for every person, but I don't think I would have done that in college. It's too transitional a time for everyone involved. We were both a few years out of college by the time we met, and had the experience of living on our own for several years, becoming financially stable, etc.

Generally I would say... if you're still in college, wait until you have a ring. In my case, we'd already talked about the possibility of marriage and I was pretty secure in the idea that the relationship was going somewhere