Refund!?! Oh, you mean the money the IRS gives you back because you paid too much to begin with! Blah.. I just got a letter from the IRS saying I OWE them another $10K and change, not including penalties and interest.. from my 2004 return

Fortunately, they are wrong and I really only owe them about $400 due to a missing 1099-INT form. I haven't even started worrying about my 2005 return yet, but I'm sure it will result in yet another check going TO the IRS, not the other way around.
As others have pointed out, the best refund is no refund. And as Moe mentioned, if you don't do anything but put the cash in a bank, you can get a few dollars more for it. Even the dismal interest rate on saving accounts is better than nothing, 3.5% is a little better than that, and while I prefer to invest in higher yeild areas (getting around 22% average this year), anything you get is better than squat.
Cheers,
Brad