That is a great bit of advice, doc. One thing I'd add though, is that one must be careful never ever to criticize past employers, make tactless disparaging remarks, or describe one's inherent idleness or work-shy habits on the blog. Once a potential employer has seen the URL of your blog on the CV/resume, he/she will take it as an invitation to read it. It has got to give the same impression as your resume, CV and letter of application; and be consistent with it.

You may think that this is a glimpse of the flaming obvious, but I could regale you with true stories of occasions where candidates have put themselves at a disadvantage in interview because of their reckless blogging. (It would be wrong for a potential employer to reject an applicant before interview because of this, of course). This is one of the reasons I write under a 'pen-name'!