Looking for System Admin resource center

HI - I am interested in improving my AS/400 Network Admin skills. I would like 
to know about any books reccommended/for sale, or web sites. I am interested in 
hearing about large sites and network situations (Typical) issues and problems. 
I have been in a mixed environment, but never understood fully how resources 
are shared, how for example, 
 
an AS/400 that I monitored, occassionally if it went down or was degraded in 
some way (power outage but not only that), it would affect a SQL Server 
somewhere else in the room.  
 
Also how to also fully utilize the AS/400 in a mixed environment. For example, 
to have the AS/400 involved in backups, email, etc... Is this done/worthwhile? 
I was in a shop where there was a push to load the NT Servers onto the AS/400. 
It sounded like a good idea to me, but not to the NT Admin. The CIO didn't like 
it either. OK but in a shop that is more predominantly AS/400 would this be a 
better idea, why?
 
So many questions, hope they are interesting at least,
Thanks,
Rob


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