Fidelity, the financial services firm most known for its actively managed mutual funds and dominating presence in the 401(k) arena, launched 10 sector exchange traded funds on Thursday. Although Fidelity previously sponsored one ETF, Thursday's launches mark the firm's first deep foray into ETFs. While the Fidelity sector funds do not differ dramatically from rival products offered by State Street Global Advisors and Vanguard, at least part of the big news is fees. As in Fidelity's 10 sector ETFs each charge 0.12% per year, lower than the 0.14% charged by most of the Vanguard sector funds. [ Fidelity Sector ETFs Could Challenge Vanguard ] Some market observers see the potential for Fidelity to make a splash in the ETF business.