There are a few notable federal income tax breaks that may apply to small business this year, but you need to take advantage of them before December 31. If you aren't already aware of them, there is a quick summary in a post from SmartMoney.
These incentives only apply if you buy equipment or software this year, but if you have the means and the need, it may be in your interest to make those purchases in 2009. Yes, SmartMoney's post is from August, so I'm late picking up on it, but there is still time. Be sure to read through the exceptions depending on your business' organization structure. And check with your accountant or tax preparer if you have questions.