If you can pin down a copy of the first few editions of Mac Secrets, there was a program on the disks which accompanied the book with a program called FlashIt. It was what the authors of the book used to capture menu bars and other screen shots they published.
I think they included Snapz with later editions of the book, but I could be mistaken.
I don't recall if FlashIt was freeware, shareware, or commercial software included with the book (as Secrets did with some titles) offhand. If it winds up being freeware/shareware, I'd definitely be willing to send you a copy.