The IRS has issued the 2013 contribution limits for health savings accounts: $3,250 for single plans and $6,450 for family plans. The 2012 limits are 3,100 for single plans and $6,250 for family plans.
You need a “high deductible” plan to qualify to make an HSA contribution. For 2013, that will be a plan with an annual deductible of at least $1,250 for single plans and $2,500 for family coverage; these are increases over the the 2012 amounts. The plans can’t have annual out-of-pocket expenses (besides premiums) for 2013 in excess $6,250 for single coverage and $12,500 for family coverage; the 2011 amounts are $6,050 for single coverage and $12,100 for family coverage.
Link: IRS Publication 969 on HSAs.