Well, roxydiva, you've gotten lots of advice (I won't say good or bad!) on this issue. I will throw in my two cents in a minute, but I do want to make one important point to you. EVERY relationship is different. Only you know where your relationship is, and what could make or break it.
With that said Mr. ajuhdg and I lived together for six months (good idea to have a short lease, just in case!) after we had dated for a year. It was TERRIBLE. He was a spoiled rotten brat...okay well I am too! Neither of us was prepared, and the six months ended with me kicking him out and him moving into his frat house. We were broken up for about three months, and it allowed us both some time to reflect. (I know it sounds cheesy!) We both knew that we wanted to be with each other, and our living together made us realize that real relationships are about compromise. We dated for four more years, and we've now been married for a little over two.
Here's my point...I personally would have killed him if we would have never lived together before we got married....it's just TOO different! Plus, living together lets you see how much work you have ahead of you!
It took me a year to train him to put the toilet seat down!
aj