Postgresql.conf - What is the default value for log_min_message?

Hi,
I've two questions.
(1) I updated logging_collector = true in postgresql.conf because I want to rotate the logs.  I'd also like to set the
log_min_messageto 'debug5' so that I can better debug the code for now and will change it back to a lower level when
it'sin production.  I'm looking at the postgresql.conf file and the log_min_message is commented out.  So what is the
default?
(2) At PgEast2010, I heard someone mentioned about putting the log file to another server?  Is that true?  If so, why?
Imight have heard it wrong. 

Thanks in advance.
Mary