If you were covered by a high deductible health insurance plan in 2010, you have until April 18, 2011, to make a tax-deductible contribution to an HSA. This account gives you a triple tax benefit: you deduct the contributions (whether or not you itemize other deductions), earnings in the account are tax deferred, and withdrawals for uninsured medical expenses are tax free.
The contribution amount for 2010 is $3,050 if only you are insured, or $6,150 for family coverage. If you were at least 55 years old by the end of 2010, you can contribute an additional $1,000.