I'm guessing that it is just a syntax thing...somewhere in the SQL
Server engine, it makes it easier for them to handle the comparison. 
Oddly, the update isn't like that...when you set a column to NULL, you
use "col_name = NULL", not something like "col_name TO BE NULL"

On the subject, here is a pretty good article about why NULL should be
avoided....
http://www.aspfaq.com/show.asp?id=2073

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