> What is the difference between firebirdsql.jar & firebirdsql.rar?

rar - Resource ARchive, standard JCA deployment archive. It contains
firebirdsql.jar and deployment descriptor in META-INF/ folder.

> I saw something in the html release notes and it does not mention it.
> However it does say something about a jdbc 2.0 and 3.0 driver.

Code for the driver itself is the same. firebirdsql.rar makes sense
only for JCA capable application server.

Best regards,
Roman Rokytskyy