Thinking to try to get some useful "objective" data
instead of the religious arguments in which I was a
participant, I went to the local Barnes & Noble
bookstore to check the computer books. They had none,
so I went to the BIG Barnes & Noble store in West Long
Branch, NJ, where they have lots. Even when trying to
be objective, there were many problems, due to the way
the store is organized.

However, here are the "hard" data:

Microsoft Office books:     20 shelves full
Windows/Windows 98 books:   15 shelves full
Windows NT books:            5 sheves full
Visual Basic books:          8 shelves full
Microsoft ODBC books:        at least 1 shelf (I forgot
                             to write it down)

Other OS's (OS-2, Mac, etc.: 4 shelves full

Linux and Unix books:        6 shelves full
X Window System books:       1 shelf full
Oracle and Oracle 8:         5 shelves (I do not know
                               if it runs on Windows
                               or not)

Actually, I was surprised to find as many Linux/Unix 
books as that. I did not do a lot of the yellow Dummies
books (mostly Microsoft-oriented) because I did not know
what OS's some of the stuff ran on.

Likewise, I ignored all the C, C++ and Networking books
since that can run on any OS with the proper compilation
system of course. Things like Apache for running
websites (it appears that more web sites use that than
the others by Microsoft and Netscape than any others)
and C,C++ come free with Linux but cost extra with
Windows.