Would it make sense to sell a stock, then repurchase it for tax purposes?
What you're talking about is called "tax gain harvesting," and it is considered good tax management. From The Oblivious Investor, investors in the 10% or 15% bracket pay 0% tax on long-term capital gains. For an interesting take on never paying income taxes again, check out Go Curry Cracker. You can claim up to $70,000 or so in capital gains before paying any taxes if you are the 10% or 15% tax bracket.