I'm a long-time fan and dedicated user of the O'Reilly Nutshell series, but I must request an updated version of the System Performance Tuning book by Mike Loukides. While it is expertly written and easy to understand, it is terribly out of date. Perhaps you could schedule a re-release when the next version of Essential System Administration is written? Regards, Francis J. Ferry, Jr. Unix Administration FPICIG