Congratulations Shigsy! Its a wonderful feeling! We paid ours off in 1995 I think. When we built the new house, DW wanted to hurry it along by getting a loan, but I couldn't bring myself to do it, so we built as we had money to do it. Now with all the commotion in the economy, every once in a while DW gives me a hug and says, "sure glad we did it without debt". Even if you aren't completely FI, the feeling of having safe haven for your family without being in "bondage" is a wonderful thing.
As others have said, make sure the "mortgage payment" is still "paid" every month, into your "Financial Independence" fund (minus a small amount of play money, of course)...enjoy your celebration dinner!
R