$6,000 per year to save

Can we save $6,000 per year extra to pay towards our mortgage? In April 2009, April 2010 and April 2011, I would like to have 6 grand set aside to pay down our mortgage. Can this be done or is it too hard of a concept to grasp? Certainly if I wait until April 09 I will not have the money saved. But if I break it down to a weekly amount of $115 per week I think it would be more doable. Yeah! Paying off the mortgage even faster would be exciting. $115 is really not a lot of money. If needed it could come from savings but better shopping practices, eating out less often etc. will help also. I easily paid off my car lease and car loan but the mortgage is a much longer and harder to stick with goal.
I currently have $250 per week being sent electronically to our mortgage company to pay down the principal. I could add the $115 per week to this or save it in a separate account. If I save it in a separate account I might decide to use the funds elsewhere. Not a good plan. The best way to handle it would be to use existing paychecks and pay it at the same time as the other principal payment.
Any ideas?