Despite the continued signs of sluggishness in the economy, America's millionaires are more optimistic about our financial future than they've been in years. That's the upshot of a new poll out from Fidelity Investments, which surveyed 1,000 households with more than $1 million in investable assets. The respondents gave the "future of the financial environment" the highest rating it's had since the creation of this particular survey, back in 2006.