When its all said and done, To get a HUGE return is actually not what you want to be doing anyway. I basically for all intents and purposes broke even. (pay $500 to the state, but got a return of $1,000 fed) I will not be adjusting my withholdings at all.
For those of you claiming zero all year so that you get a huge return: all you are doing is allowing the government to use your money to make money. Believe me they are taking you money and making money hands over fist. What it mean is: if you are receiving a regular return of $3800 fed, then you are paying out ~$70 a week too much in taxes. that's $70 a week on your take home check that you don't have the use of. that's not smart money handling. If you are the type that Likes a once a year "bonus" then force yourself to save your own money and not touch it, but don't let the government have it for a year. In your own savings account you are making money (I know not much, dividends are low on savings accounts but its something).
Or better yet lets think of all the debt you might not have gotten yourself into had you had $70 more a week. With $70 more a week in any good budget, that's ~$280/month that you could have bought necessities and not had to rack up a credit card that you paid high interest on. So not only are you losing the ability have money on your check, you are letting the government make money with your hard earned cash, while you rack up credit cards. All just so you can get it all back once a year to pay off credit cards....
Cliffnotes: The government is not looking out for you.