Every January I reset back to the typical default withholding and don't think about it till October. In October I take a close look at what I've withheld and what I'll likely owe, then I adjust for the rest of the year.
I get the best of both worlds. The government does not get an interest-free loan, and I basically get a 3-month "bonus" during the holiday season when people sometimes need more money anyway.
Stop getting those huge refunds, give yourself a 3-month pay-raise at the end of every year instead.
<WarMoose> Think about how stupid the average person is. Now realize that half of them are dumber than that.
<Chunda> Why half?