I used TurboTax last year, but will probably use TaxAct this year. Both were able to find deductions I had missed prior to using them - its not quite as good as having a dedicated tax specialist, but its much less expensive.
One thing to keep an eye on, with how bad the MD state budget is: in California, the state gov't is considering issuing IOUs instead of rebates for overpaid taxes:
Note to Californians: File tax returns ASAP - Smart Spending Blog - MSN Money
...which would be an incentive to file as soon as you have all your documents, in case O'Malley and the legislature decide to follow CA's lead. As the article says at the end, it also suggests reviewing one's withholding levels so as to minimize overpaying of taxes would be a good idea, too.
