I'll chime in with Tim Erickson. There are other good teaching programs available. DataDesk is less expensive than Minitab, has available a supplementary text, and (for what it is worth) was the source of many of the computer displays in the AP booklet. It is being used at a number of high schools this year, but I haven't seen much mention of it on this board.
I would, of course, be happy to discuss teaching with DataDesk with anyone.
-- Paul Velleman
Claimer: I develop DataDesk, so I am hardly disinterested, but I am informed.