Hi Alan ,
You can start with the hibernate tutorial available at roseindia.com.
It is very easy to undrstand and covers the basics of hibernate
nicely. you can also refer a bok named "Hibernate in action".

Regards
Charanjeet

I once found this free video on some site. Two authors of hibernate
introducing it and explaining the design choices. Don't remember the
link, but I guess you could found it by searching.