> I just want something simple to draw the digrams and represent FK
> relationships and types.

Try this:
* Create a database schema
* Use SchemaSpy to connect to the database and generate a navigable Web
site describing the schema (including FK relationships, types, etc.)

If you really want to draw diagrams by hand, you might try Inkscape,
Dia, QCad, or OpenOffice.org Draw.
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