

In Pictures Offers an excellent step-by-step picture orientated Base tutorial.
Sheep Dog Guides Offers a fairly detailed Base tutorial.
Martin Baker Has written a tutorial about building a relational database with OpenOffice Base.
Andrew Pitonyak Better known in the Open Office community for his macro programming skills, offers a Base tutorial, along with some intersting examples.
Getting Started With Base (
Direct link to 1.6Mb PDF file) Chapter 10 of the "Getting Started Version 2 User Guide" from the OpenOffice Documentation Project.
(The Documentation project is currently working on version 3 of the Base User Guide. However, much of the version 2 guide is still relevant to the current version of Base.)