I want to pay the total at the end of the year so that I can gain more interest in the bank. What form must I fill out and what do I enter?

Reminder that penalties are based on the amount due each quarter and not based on the total amount, so you would end up paying more.

I believe the rule is 100% of last year's taxes or 90% of the current year, then no penalties are assesed.

You would need to fill out the withholding and claim a number of dependents that allow you not to have any withholdings.

Of course a savings account at less than one percent interest is not first going to be worth that much, second most people end up spending it not saving it, and lastly the penalty for under paing would normally be more than any interes would

Of course what you're proposing is illegal. You can't claim exemption from withholding UNLESS your total tax obligation for 2009 was $0 and you expect your tax liability for 2010 to also be $0. You also may not claim more allowances on your W4 than you are entitled to per the instructions.

Would it be beneficial in your opinions to make the payments quarterly? To avoid the penalties and still meet my tax obligations.

Quarterly estimated payment are a viable alterntaive to withholding from your paycheck, but the withholding process is somewhat more efficient, especially if you can accurately estimate what your 2010 tax liability come 15 April 2011 will be.