I've been a career sysadmin, so having chapters authored in a couple of Solaris certification study books certainly looked good on my resume and was relevant to my experience; nobody ever told me if that helped cinch the deal when moving onward and upward, though.
I know that for one position (where I spent 12 years and lived in two different cities) part of why I got the job was that an interviewer said "He's one of the guys that maintains the Sun-Managers mailing list!" (they still had a large number of Sun boxes at the time).
I will say it was weird writing about the VI editor but then having to submit to the publisher in Word/DOC format. Of course I used free/OSS tools to convert to DOC before submission.
I know that for one position (where I spent 12 years and lived in two different cities) part of why I got the job was that an interviewer said "He's one of the guys that maintains the Sun-Managers mailing list!" (they still had a large number of Sun boxes at the time).
I will say it was weird writing about the VI editor but then having to submit to the publisher in Word/DOC format. Of course I used free/OSS tools to convert to DOC before submission.