The AMT is a bit of a tricky calculation. The IRS has reported more AMT calculation errors than any other single tax issue in the past couple years.
This prompted them to set up a great little tool on their website. It is an On-Line AMT Assistant.
Basically, you'll take your tax information from a completed 1040 and fill out a short survey to decide what, if any, AMT is owed.
You can find the 2006 AMT Calculator here:
And can plug in some estimated values to get a decent idea of whether AMT will be owed.
If so, it will direct you to form 6251, the AMT form, as seen here:
You can read more about the AMT in the instructions for the 6251 form here:
Basically, because so many factors go into the AMT calculation I can't tell you for sure based on just your AGI whether you'd need to pay any AMT. You'll want to first estimate the AMT assistant and then look at the 6251 instructions to figure what if any AMT you owe.
Factors include filing status (married, individual, etc.), itemized deductions
(both type and amount), children (if any), and AMT paid in previous years.