The weird thing is that 5 year adjustable rates are higher then 30yr. fixed. That only makes sense if interest rates will go down over the next 5 years, which seems unlikely to me.
If you look at it from the bank's perspective it makes more sense. I got a 5 year and paid it off early. The bank got about 8% of my home value. My friend has a 30 year and the bank will get ~110% of his home value.
Adjustable-rate mortgages are not.