sounds about right to me, too. I think the EIC is a big part of it. In 2007, DH made $38,000 and we got almost $5k back (4 kids). In years before, he made less money and of course, we had less kids but we've always counted on getting between 4-7K, depending on his income and expemptions he claimed all year long. Occasionally, we'd adjust them so that changed things up a bit.
For 2008, DH got a decent promotion so for the first time, we are not getting near that much back. When you make more, you definitely pay more in taxes (and don't get EIC) but we kept his exemptions lower than the allowed amount and will get a little more than 2k back. For this year, we are adjusting so that we are closer to breaking even. It depends on a number of factors, including other deductions you have (houses, medical expenses, etc.,)