books every network operator should read?

[Janet Sullivan <ciscogeek () bgp4 net>]

I'd like to make a list for the BGP4.net wiki of books that are thought 
highly of by the network community.  What books stand out for you as 
being excellent?  If you could only own 5 network related books, what 
would they be?

Feel free to reply to me offlist - I'll post a summary after a few days.

Thanks!

Janet