Rabbit Hole is the 3.0 development version of JBoss. As a work in progress, code is changing fast.
There are no binaries. You have to download the code and build it. The docs that you are asking are being elaborated right now :)
Anyway, this question is more suitable for the "New to JBoss" forum.
The following chapter on jdbc is appropriate for jboss 2.4. I thought maybe we needed different versions of the manual... but no one has time.