Gosh, we're slow!
I think it depends on where you decide to put your money and where you are in your life, too. DH and I are both 41 and we'll have the house paid off in 8 years. But we only bought it 8 years ago and with 3 kids, 2 dogs and elderly family in the area (who require some time/care), paying off the house hasn't been our priority.
Rather, well-funded retirement funds, college savings, and general savings (and putting aside money for Disney every year!) has been our priority instead. We have a bi-weekly payment on the house and we toss some extra principal at it every year but that's it.
We've got a low interest rate and we're happy with our decisions.
As far as ideas on paying it off early, if you're in the early part of your mortgage you can do the bi-weekly payments (pay half the monthly mortgage payment every two weeks) and see a fairly significant shortening of your mortgage term as over the course of a year, you end up making an additional payment. If you're in the early part of your mortgage, then this can significantly shorten your term. As your loan ages, the benefit becomes less - still there, but not as significant.
Some mortgage companies will do automatic bi-weekly payments for free, some charge to set it up. Yes, it's the kind of thing you can do all by yourself but it requires a lot of discipline. We paid the $200 charge 7 years ago to have ours set up by the bank and as it took a number of years off the mortgage end date, the nominal charge for the convenience was well worth it for us.