Check your contribution levels and the balances on your 401(k), 403(b) or any similar plan, as well as on any profit sharing. At the rate you're going, will you max out your contributions before the first strains of "Auld Lang Syne" on Dec. 31?
The 2012 contribution limit for most folks is $17,000, not including any matching contributions your boss kicks in. If you're 50 or older, your contribution limit is $22,500.
If you signed up for a flexible spending account at work for medical and/or dependent care, gather those bills and fill out the reimbursement forms. Then, project the next six months of spending with what remains so that you're sure to drain the account down to $0, since some plans don't allow carry-forwards on unspent money.