BASE enables you to manipulate database data seamlessly within OpenOffice.org. Create and modify tables, forms, queries, and reports, either using your own database or BASE’s own built-in HSQL database engine. BASE offers a choice of using Wizards, Design Views, or SQL Views for beginners, intermediate, and advanced users.As it turns out there is no book available for OOo Base. So I did a search for howtos on the net and here are some of the links I found that are very useful for anyone who wants to try OOo Base.
OOoForum.org - Beginners - Example Database - Base Tutorial
SearchOpenSource.Com - How to use OpenOffice 2.0's database tool
Sheepdogguides.Com - OpenOffice.Org 2 Base Tutorial