Just came across this excellent presentation on RAC internals.
It has quite a few nuggets of information for RAC 11.2, well worth a read.
Understanding Oracle RAC Internals
Markus Michalewicz (Markus.Michalewicz@oracle.com)
Senior Principal Product Manager Oracle RAC and Oracle RAC One Node
Couple of things I picked up (which is what I was searching on)
• Listeners used for a client connection to Oracle RAC should be managed by Oracle Clusterware and should be listening on an Oracle managed VIP.
• Using server-side TNSNAMES aliases to resolve the listener configuration is not recommended.
• Listeners specified by the LISTENER_NETWORKS parameter should not be used in the LOCAL_LISTENER and REMOTE_LISTENER parameters. Otherwise, cross registration will happen and connections will be redirected cross networks.