AIG is back! The insurance giant that was saved by a $182 billion government bailout during the financial crisis has sold off assets and boosted capital in its insurance business, helping it emerge as a leaner, more focused financial company. It finished paying back the government last year and ran an advertising campaign thanking American taxpayers for the help. Investors have clearly responded -- its shares surged more than 50% in 2012 and have continued their march upward since then. It ended the year as the most widely held stock by hedge funds, pushing Apple down to No. 3. How times have changed.