Here's something that I cover by example in my book. Leo Babauta of Zen Habits did a guest post on Get Rich Slowly and spells it out even better. I'll give you the general idea and encourage you to visit his post to get the full story.
For people that have a hard time paying a little bits at a time toward debt each paycheck, you can set up systems where you pay your monthly payments and then when you money that isn't in the form of a paycheck, you put that money toward your debt. You might be able to pay off some of your debts in this way in one swoop.
This would also work for people who have gotten themselves into debt to the point where there just isn't much money left from each paycheck. You can use this "windfall" money to pay down or pay off debts. That will free up money from your paychecks that you can start paying toward the rest of your debts.
Use the money as a way to get out of debt if that system works better for you or use it as a way to get things rolling if you are using a "snowball" system. Either way, it's a great way to reduce debt more quickly and give yourself some financial leeway.
Full Article: How to Eliminate Debt in Bursts Instead of Incrementally
5 Sword Points for PTE Rick for sending me the link.