I think it is a great idea to live with the one you love to find out if it is for real. I have been w/ my girlfriend for nearly a year know and we pretty much started living together right then and there. At 1st just because we didn't want to be away from one another, then afterwards my apt. got broken into and my car got stolen and my girlfriend was right there for me, I lived with her from Thanksgiving Break until my graduation in May and I can honestly say we are that much closer now because of it.
On a side note: The one thing that is extremely hard is this long distance thing, she is know in Cali doing an internship while I work for my fraternity national office. I haven't seen her in over a month, but I'll be there in a couple of weeks to see her and spend our 1 year to together