ISAPI programmers -- Delphi, NT 4.0 & IIS

I am starting to do quite a bit of work with Delphi and ISAPI
extensions.  If there are other programmers out there working with these
tools I would like to hear from you.

I am interested hearing some opinions on a number of issues, including:

SQL Server vs Interbase
How does database access via IIS affect licensing requirements
strategies for authentication
expected integration/comatability with JBuilder and Intrabuilder

Ernest Ezis