How urgently do I need to see a dentist if I've broken a tooth?

Alright, here is the story. I don’t know much about dental type trouble, I’ve only ever had one cavity, and it was from my braces when I was a teenager.
2 years ago the filling from that cavity fell out, and I never got it refilled, because I had no pain. At the time it was originally filled, my dentist said that that those teeth (with the metal pieces that surrounded the whole tooth.. I don’t know the name) may be weak.

Well. The tooth broke today. I imagine it makes sense, since there was a hole in it for so long with nothing to support the side of the tooth. Still doesn’t hurt.

I had planned to get the tooth fixed when I have dental insurance (starting January of 2011.) Should I be in a rush to get it fixed now that it has broken, or am I okay to continue waiting until I have dental coverage? Again, no pain. It’s also near the back of my mouth, so it isn’t a cosmetic issue, and the majority of the tooth is there.