Example Database Applications

Does anyone know of any good shareware/demoware Delphi database
applications, that can be used to learn Delphi ?

Applications with or without source code would be useful, I am moving
from a Clipper background, so one of the things I am looking at is how
people structure their database applications under windows, eg menu
structures, screen designs etc.

What I am really after are complete database systems, rather than just
simple examples of HOW TO do XXXXX.

Any ideas anyone ?

Scott Paterson
Donnington Wood, Telford, Shropshire, UK.