The BBC has profiles of a paramedic and police officer who have been blogging for some time.
They explain why they blog and how they blog so they won’t lose their jobs.

So far the response to my blog has been positive, but I’ve only had feedback from fellow road staff; I’ve not been called up in front of management yet.

I suspect that management would actually approve of my blog because it does mainly show the ambulance service in a rather flattering light.

Everything about my blog is confidential, it has to be for the simple reason of patient confidentiality. It was one of the rules that I set myself right from the start.

I also keep the names and details of my workmates secret. The only things that aren’t anonymous are the names of trusts and organisations, as I think that they sometimes need to be more publicly examined.

I’m also having to be careful about what subjects I write about. Workmates might not be happy to find me writing about them, so I tend to stick to subjects that affect me personally.

I won’t write about anything that could get someone into trouble. There are better ways to handle that than to write about it on a public webspace.

I have to keep everything anonymous. If there is one thing that will get me fired, it’d be breaching confidentiality.

The article has 12 good tips for job related blogs.