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>The author of "Inside SQL Server", who is/was a key person on the Server development team, advises to avoid NULLs if at all possible. As I migrate my app to SQL Server, I see this as another reason to take his advise ...
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>a) Where it is write this ? Chapter ? Paragraph ? Page ?

See my reply to Walter

>b) NULL is a Developer limit, not a programming limit.

If you happen to like testing for NULLs ...

>c) If you abandon NULL into SQL Server, you remove 50% of SQL Server power.

NULLS are "power" ? 50 % ?

NULLs are NOT "information" ... they signify a lack, or absence, of data / information.

Only "information" is "power" ...

IMO :)