The Mac version, incidentally, is for PowerPC chipsets, not Intel.
Update sorry, someone messed up at Adobe, this turns out to be untrue, see:
for the true story
And another update It's back on line, nobody seems to know what's going on, but I'm just installing Acrobat 8 for mac and it seems to be OK - I'm a legit user of the PC version so I won't feel guilty about this if it turns out to be another error. See