Thanks for your reply. Adobe Reader 7 and 8, as expected, both are able to edit every fill-in field on the IRS fill-in 941 form. Admittedly I don't know how the IRS' Acrobat genius designs the fill-in forms, but it struck me as odd that all Reader-editable fields
except one is editable in Preview. PDF docs automatically open in Preview by default on my hardware, and frankly I like Preview and wish it were feature-equivalent to Reader as long as it remains fast to open. Thanks again.
MacBook Pro 2.33GHz 2GB RAM Mac OS X (10.4.8)