Usually one gets in trouble with AMT from deductions and long-term capital gains/qualified dividends because these lower your tax rate. Additional ordinary income is taxed at a higher rate, and once you get up into the higher tax brackets, the AMT calculation is usually less than the "regular" calculation. In other words, additional ordinary income doesn't necessarily trigger AMT.
But, if you have large deductions or a good chunk of your income comes from long-term capital gains and/or qualified dividends, you might find yourself paying AMT rates on your ordinary income.
Well, I thought I was retired. But it seems that now I'm working as a travel agent instead!