Taxes. I'm too cheap to have someone else doing them--plus, since we're dirt poor, companies offer us free tax software through irs.gov.
I calculated taxes without the software, and then used the software and found that I was off by $1000 for my return. So I heartily recommend the software, if just because it may catch things you miss (or mistakenly believe you aren't eligible for).
At the same time, however, the software isn't perfect. I reworked my taxes and found that if I decreased my return by $4, I could also significantly decrease my AGI, which is used to calculate state taxes. Yes, I don't get as much back with the feds, but I end up paying significantly less state tax. I haven't figured out the savings yet, but it's fairly significant. If you have the ability to choose between two options when doing taxes, you might want to run both options and consider state taxes into the mix. Don't trust the software completely.
Don't forget Schedule M this year, and, if you have kids, the EIC, the child tax credit, and the additional child tax credit. Also, don't forget you can take both the exemption and the standard (or itemized) deduction. Here's hoping you have a good tax return.