Another one: usually one of the first places a sysadmin is going to look when there is a problem is the log file. A good sysadmin will be able to read compiler-generated errors but still may not be able to do anything if the messages reference cryptic variable names and methods from code they've never seen. Spend a little time thinking about how an end-user, rather than a developer, would read the log file.

Obviously don't short-change yourself if you're the one who will be writing bug fixes and need detail, but a little can go a long way here, especially for problems a sysadmin may be able to diagnose and fix (connection issues, resources issues, etc.)